Adrenaline, also known as epinephrine, is a hormone produced by the adrenal glands. It plays a crucial role in the body's response to stress and emergencies. When released into the bloodstream, adrenaline triggers various physiological changes, such as increased heart rate, elevated blood pressure, and heightened mental alertness. These effects prepare the body for a "fight-or-flight" response, helping to mobilize energy and enhance physical performance. Adrenaline is an essential component of the body's stress response system and contributes to our ability to cope with challenging situations.

What is "adrenaline"?

adrenaline

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A hormone is a chemical substance produced by glands and released into the bloodstream to regulate and control various physiological processes. Hormones act as messengers, traveling through the bloodstream to target cells or organs, where they exert specific effects. They play a crucial role in maintaining homeostasis, growth, development, metabolism, reproduction, and mood regulation. Hormones are involved in numerous bodily functions, including regulating metabolism, controlling blood sugar levels, influencing sexual development and function, and modulating stress responses. Imbalances in hormone levels can lead to various health conditions and disorders. Overall, hormones are essential for coordinating and regulating the complex interconnected systems within the human body.

What is a "hormone"?

hormone

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Anatomy refers to the structural composition and organization of the body's organs, tissues, and systems. It encompasses the precise arrangement and interconnection of bones, muscles, organs, blood vessels, nerves, and other anatomical components that contribute to the body's form and function. Understanding human anatomy is essential for comprehending how our bodies work, including the relationships between different body parts and their roles in maintaining overall health and well-being.

What is "anatomy"?

anatomy

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The appendix is a small, finger-shaped pouch located at the junction of the small and large intestines in the human body. While its exact function remains unclear, it is believed to play a role in the immune system, as it contains lymphatic tissue. The appendix can become inflamed, resulting in a condition known as appendicitis, which requires surgical removal to prevent complications. Though it is considered a vestigial organ, the appendix may have some immunological significance and potential contributions to gut health.

What is "appendix"?

appendix

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The armpit, also known as the axilla, is the hollow area located beneath the shoulder joint where the upper arm connects to the torso. It is a complex region containing lymph nodes, blood vessels, nerves, and sweat glands. The armpit plays a role in regulating body temperature through sweat production and acts as a passage for lymphatic drainage. It is also a site where body odor can develop due to the presence of apocrine sweat glands. The armpit is an important anatomical area that serves both functional and physiological purposes in the human body.

What is an "armpit"?

armpit

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An artery is a blood vessel that carries oxygenated blood away from the heart and distributes it to various parts of the body. Arteries have thick, muscular walls that enable them to withstand the pressure generated by the pumping action of the heart. They play a crucial role in maintaining the circulation of oxygen and nutrients to tissues and organs throughout the body. Arteries branch into smaller vessels called arterioles, which further divide into capillaries, allowing for the exchange of oxygen, nutrients, and waste products between the blood and surrounding tissues. Arteries are vital components of the circulatory system and are essential for overall health and proper organ function.

What is an "artery"?

artery

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The biceps is a skeletal muscle located in the upper arm. It is a prominent muscle that consists of two heads, the short head, and the long head, which converge to form a tendon that attaches to the radius bone of the forearm. The biceps muscle is responsible for flexing the elbow joint, allowing for movements like bending the arm and bringing the hand closer to the shoulder. Additionally, it contributes to the supination of the forearm, rotating the palm upward. The biceps muscle is highly visible and commonly associated with strength and physical fitness. It is actively engaged during activities that involve lifting, pulling, and gripping.

What is "biceps"?

biceps

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The breastbone, also known as the sternum, is positioned at the center of the chest. It is a flat bone that forms the front part of the ribcage, providing protection to vital organs like the heart and lungs. Connected to the ribs through cartilage, the breastbone offers support and stability to the chest. It serves as an attachment site for various muscles involved in respiration and upper body movements. Furthermore, the breastbone contributes to the overall shape and structure of the chest, aiding in the formation of the ribcage.

What is "breastbone"?

breastbone

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The calf refers to the muscular area located at the back of the lower leg, between the knee and the ankle. It is primarily formed by the gastrocnemius and soleus muscles, which work together to allow for plantar flexion of the foot (pointing the toes downwards) and assist in walking, running, and jumping movements. The calf muscles are among the strongest in the body and play a crucial role in providing power and propulsion during locomotion. They also contribute to maintaining proper balance and stability. Understanding the anatomy and function of the calf is important for lower limb strength, endurance, and overall lower body performance.

What is "calf"?

calf

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A cell is the basic structural and functional unit that forms the foundation of all living organisms. It is the smallest unit of life capable of carrying out essential processes, such as metabolism, reproduction, and responding to stimuli. Cells have specialized structures and organelles that enable them to perform specific functions, such as the nucleus containing genetic material, mitochondria producing energy, and the cell membrane regulating the exchange of substances. Together, cells make up various tissues, organs, and systems, working harmoniously to maintain the body's structure, function, and overall health.

What is a "cell"?

cell

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The cheekbone, also known as the zygomatic bone, is positioned in the middle of the face. It is a prominent bone that forms the structure of the cheek and contributes to the overall contour of the face. The cheekbone serves as a foundation for the soft tissues of the face and provides support to the eyes, nose, and other facial structures. Additionally, it plays a significant role in facial expression, adding definition to the face and contributing to its aesthetic appearance. The cheekbone also plays a crucial role in protecting the underlying structures within the skull.

What is "cheekbone"?

cheekbone

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The chin is the protruding, bony prominence located at the lower part of the face, beneath the lower lip. It plays a significant role in facial aesthetics and defines the lower border of the face. The chin provides support to the lower jaw and aids in various functions such as speaking, eating, and facial expressions. Its shape and prominence can vary among individuals and contribute to the overall appearance of the face.

What is "chin"?

chin

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Circulation refers to the continuous movement of blood throughout the cardiovascular system. It is driven by the rhythmic contractions of the heart and facilitated by a network of blood vessels, including arteries, veins, and capillaries. Circulation ensures the delivery of oxygen, nutrients, hormones, and other vital substances to all tissues and organs while removing waste products and carbon dioxide. It plays a vital role in maintaining cellular function, supporting organ systems, regulating body temperature, and facilitating the immune response. Proper circulation is essential for overall health and well-being.

What is "circulation"?

circulation

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The collarbone, also known as the clavicle, is a slender bone that runs horizontally between the sternum (breastbone) and the shoulder blade (scapula). It serves as a vital structural component of the shoulder girdle, providing support and stability to the upper limbs. The collarbone aids in transmitting forces from the arms to the axial skeleton and allows for a wide range of shoulder movements. Its position and shape contribute to proper shoulder joint function, enabling actions such as arm elevation, rotation, and retraction. Additionally, the collarbone serves as an attachment site for various muscles and ligaments, enhancing the overall mobility and function of the shoulder joint.

What is "collarbone"?

collarbone

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The fist is a hand gesture formed by curling the fingers tightly and folding them inward, with the thumb positioned over the fingers. It represents a closed and clenched hand, symbolizing strength, power, and determination. Making a fist allows for increased grip strength and provides a solid surface for striking or defending oneself. It is commonly used in martial arts, self-defense techniques, and as a gesture of solidarity or determination. Understanding the concept and formation of a fist is important for physical activities, expressive gestures, and cultural symbolism.

What is "fist"?

fist

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The palm is the broad, fleshy part of the hand, located between the fingers and the wrist. It is characterized by a unique pattern of lines and creases, known as palmistry or palm lines. The palm plays a fundamental role in hand movements and functions, such as gripping, grasping, and manipulating objects. It houses various muscles, tendons, and ligaments that enable fine motor skills and intricate hand movements. The palm is also a sensitive area that contains many nerve endings, contributing to tactile sensation and touch perception. Understanding the anatomy and function of the palm is important for hand coordination, dexterity, and overall hand functionality.

What is "palm"?

palm

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The forehead is the area of the face that extends from the eyebrows to the hairline. It plays a significant role in facial expressions and communication, as it is capable of expressing various emotions such as surprise, worry, or concentration. The forehead also serves as a prominent feature of the face, contributing to overall facial aesthetics. It provides a canvas for facial expressions and can be an indicator of age, as wrinkles and lines may appear on the forehead over time.

What is "forehead"?

forehead

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Genitals refer to the reproductive organs that differentiate between males and females, including the external and internal structures involved in sexual reproduction. In males, the genitals encompass the penis and scrotum, while in females, they encompass the vulva and internal reproductive organs such as the vagina, uterus, and ovaries. The genitals play a crucial role in sexual pleasure, reproduction, and the development of secondary sexual characteristics. Understanding and respecting the diversity and function of genitals are essential for promoting sexual health, identity, and well-being.

What are "genitals"?

genitals

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The heel is the back part of the foot, located below the ankle and behind the arch. It is a weight-bearing structure that provides stability and support during walking, running, and standing. Composed of bone, muscle, fat, and connective tissues, the heel absorbs impact and helps propel the body forward. The heel is also home to the calcaneus bone, which plays a vital role in supporting the body's weight. Understanding the anatomy and function of the heel is important for maintaining balance, preventing injuries, and ensuring proper foot mechanics.

What is "heel"?

heel

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The gut, also known as the gastrointestinal tract, is a long tube that starts from the mouth and extends all the way to the anus. It consists of several organs, including the esophagus, stomach, small intestine, and large intestine (colon). The gut is responsible for the digestion and absorption of food, as well as the elimination of waste products. It is lined with specialized cells that aid in the breakdown of food through the release of enzymes and the absorption of nutrients into the bloodstream. The gut also houses a complex community of microorganisms known as the gut microbiota, which play a crucial role in maintaining overall health and immune function.

What is "gut"?

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The hip is a major joint in the human body that connects the thigh bone (femur) to the pelvis. It forms the articulation point between the lower body and the upper body, providing stability, support, and range of motion. The hip is located on the side of the body and is responsible for bearing weight, facilitating walking and movement, and maintaining balance. It consists of a ball-and-socket joint that allows for various motions, including flexion, extension, abduction, adduction, and rotation. The hip is crucial for overall mobility and is surrounded by muscles, tendons, and ligaments that provide strength and control during physical activities.

What is "hip"?

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The intestine is a vital organ in the human body responsible for the digestion and absorption of food. It consists of two main parts: the small intestine and the large intestine. The small intestine is where most of the nutrient absorption occurs, while the large intestine primarily functions in water absorption and waste elimination. Together, they play a crucial role in the breakdown of food, extraction of nutrients, and elimination of waste products, contributing to overall digestive health and bodily function.

What is "intestine"?

intestine

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The stomach is a muscular organ located in the upper abdomen that plays a key role in the digestion of food. It receives food from the esophagus and breaks it down further using acid and enzymes, preparing it for further digestion and absorption in the intestines. The stomach also helps regulate the release of food into the small intestine and aids in the digestion of proteins.

What is "stomach"?

stomach

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A joint is a structure in the body where two or more bones come together. It allows for movement and flexibility, enabling the body to perform various activities. Joints are crucial for mobility and range of motion in different parts of the body, such as the limbs, spine, and fingers. They are supported by ligaments, which provide stability and hold the bones together. Joints can be classified into different types, including hinge joints, ball-and-socket joints, and pivot joints, each with its own unique structure and movement capabilities.

What is a "joint"?

joint

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The jaw, also known as the mandible, is the largest and strongest bone in the human skull and plays a crucial role in various essential functions. The jaw is responsible for activities such as biting, chewing, and speaking. It serves as a framework for the lower teeth and provides support to the facial structures. The movement of the jaw is controlled by powerful muscles, allowing for precise and coordinated actions during eating and speaking. Additionally, the jaw contributes to the aesthetics of the face and plays a significant role in facial expressions and overall facial symmetry.

What is "jaw"?

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The lap refers to the area formed by the upper thighs when a person is seated, typically supported by the knees or a surface. It is a comfortable and often used space where objects can be placed, or where a child or pet can rest. The lap provides a sense of warmth, security, and closeness, making it a common place for activities such as reading, holding a baby, or petting an animal. It serves as a personal and intimate space where connections can be fostered and cherished, representing a comforting and nurturing aspect of human interaction.

What is "lap"?

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A limb is an anatomical term that refers to the appendages or extremities of the human body, including the arms and legs. These structures provide mobility, dexterity, and support for various physical activities. The limbs are composed of bones, muscles, tendons, and joints that work together to facilitate movement and perform tasks such as grasping, walking, running, and manipulating objects. Each limb consists of several segments, such as the upper arm, forearm, hand, thigh, leg, and foot. The limbs are vital for locomotion, balance, and interaction with the surrounding environment, playing a crucial role in daily activities and overall physical function.

What is a "limb"?

limb

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The nervous system is a complex network of specialized cells and tissues that coordinates and controls bodily functions. It includes the brain, spinal cord, and peripheral nerves, which transmit electrical signals and information throughout the body. The nervous system regulates voluntary and involuntary actions, processes sensory input, enables communication between different body parts, and facilitates higher cognitive functions such as thinking and memory. It plays a vital role in maintaining homeostasis, coordinating movements, and responding to external stimuli. The nervous system is integral to overall body functioning and is responsible for our ability to perceive, interpret, and interact with the world around us.

What is "nervous system"?

nervous system

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A vein is a type of blood vessel that carries deoxygenated blood from the body's tissues back to the heart. Veins have thinner walls compared to arteries and often have valves to prevent the backward flow of blood. They play a crucial role in the circulatory system, facilitating the return of blood to the heart for oxygenation. Veins are distributed throughout the body, working in coordination with arteries to maintain proper blood flow and ensure the efficient exchange of gases, nutrients, and waste products between the tissues and the cardiovascular system.

What is a "vein"?

vein

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Tissue refers to a group or collection of specialized cells that work together to perform a specific function. Tissues can be categorized into four main types: epithelial, connective, muscle, and nervous. Epithelial tissue forms protective barriers and linings, connective tissue provides support and structure, muscle tissue enables movement and contraction, and nervous tissue facilitates communication and electrical signaling. Tissues are the building blocks of organs and systems, playing a vital role in maintaining the body's structure, function, and overall homeostasis.

What is "tissue"?

tissue

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The thigh is the upper part of the human leg, situated between the hip and the knee. It consists of large muscles, such as the quadriceps and hamstrings, along with various blood vessels, nerves, and connective tissues. The thigh plays a vital role in walking, running, and other leg movements, providing strength, stability, and power. It is essential for maintaining balance, supporting body weight, and enabling a wide range of physical activities. Understanding the anatomy and function of the thigh is important for injury prevention, rehabilitation, and overall lower limb function.

What is "thigh"?

thigh

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The spine, also known as the vertebral column or backbone, consists of a series of individual bones called vertebrae, stacked on top of each other and separated by intervertebral discs. It runs along the center of the back. The spine provides structural support to the body, allowing for an upright posture and protecting the spinal cord, which is housed within the spinal canal. It plays a crucial role in facilitating movement, flexibility, and stability of the body. The spine also serves as an attachment site for various muscles, ligaments, and tendons, contributing to overall movement and coordination. Additionally, the spine helps distribute forces and absorb shock during activities such as walking, running, and lifting. Proper care and maintenance of the spine are essential for maintaining overall health and well-being.

What is "spine"?

spine

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Pulse refers to the rhythmic expansion and contraction of arteries caused by the heartbeat. It is commonly measured at pulse points, such as the wrist or neck, and reflects the rate and strength of the heartbeat. The pulse provides valuable information about the cardiovascular system's function, including heart rate, rhythm, and overall circulation. It serves as a vital indicator of health and is used to assess physical fitness, monitor vital signs, and detect irregularities or abnormalities in the cardiovascular system.

What is "pulse"?

pulse

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The ribcage encompasses the chest and consists of the sternum (breastbone), the thoracic vertebrae, and the ribs. It forms a protective enclosure around vital organs such as the heart, lungs, and major blood vessels. The ribcage provides structural support to the upper body, helps maintain the shape and stability of the thoracic region, and plays a critical role in respiration. During breathing, the ribcage expands and contracts, allowing for the intake of oxygen and the expulsion of carbon dioxide. It also serves as an attachment point for various muscles involved in the movements of the chest, shoulders, and upper limbs.

What is "ribcage"?

ribcage

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The skull is a complex structure that houses and safeguards the brain. Comprised of fused bones, such as the cranium and facial bones, it provides essential support to sensory organs like the eyes, nose, and ears. Acting as a sturdy shield, the skull ensures the brain's stability and protection, serving as the central command center for the body's functions.

What is "skull"?

skull

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Here you will learn some English words about the human body, such as "hormone", "forehead", "calf", etc. that are needed for the TOEFL exam.

与"人体"相关的词汇 | TOEFL必备词汇