The trachea, commonly referred to as the windpipe, is a vital respiratory structure in the human body. It is a flexible tube that connects the larynx to the bronchi, allowing air to pass in and out of the lungs. The trachea is composed of rings of cartilage, which provide support and prevent collapse during breathing. It is lined with a layer of specialized cells that produce mucus, helping to trap dust, pathogens, and other foreign particles, and it is equipped with cilia that move in a coordinated manner to propel the mucus upward. The trachea plays a crucial role in the respiratory system, ensuring the proper flow of air into and out of the lungs.

What is "trachea"?

trachea

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The larynx, also known as the voice box, is a part of the human body located in the neck region. It plays a vital role in speech and respiration. The larynx houses the vocal cords, which vibrate when air passes through, producing sound and allowing us to speak. Additionally, it acts as a protective mechanism by preventing food and liquids from entering the airway during swallowing. The larynx is essential for vocalization and serves as a crucial anatomical structure in the human communication system.

What is "larynx"?

larynx

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taste bud

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An incisor is a sharp, chisel-shaped tooth located at the front of the human mouth, either in the upper or lower jaw. It is designed for cutting and biting into food. Typically, adults have four incisors, two central incisors, and two lateral incisors. The incisor has a flat surface and a thin edge, allowing for effective slicing and shearing of food. It plays a crucial role in the initial stages of chewing and is visible when a person smiles. The incisor also contributes to the clarity of speech by aiding in the pronunciation of certain sounds.

What is an "incisor"?

incisor

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Enamel is the hard, outermost layer of the human teeth that covers the tooth crown. It is the hardest substance in the body and serves as a protective barrier against tooth decay and mechanical damage. Composed primarily of minerals, mainly hydroxyapatite crystals, enamel is translucent and ranges in color from white to light yellow. Enamel does not contain living cells, so it cannot regenerate once damaged. Therefore, maintaining good oral hygiene practices and minimizing exposure to acidic substances are essential for preserving the integrity of enamel and promoting overall dental health.

What is "enamel"?

enamel

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Phlegm is a thick and sticky mucus-like substance produced by the respiratory system. It is primarily composed of mucus secreted by the mucous membranes lining the airways. Phlegm serves as a defense mechanism to trap and remove foreign particles, such as dust, bacteria, and viruses, from the respiratory tract. It can be coughed up or expelled through sneezing, aiding in the removal of irritants and helping to keep the airways clear. Changes in the color, consistency, or amount of phlegm can provide indications of certain respiratory conditions or infections.

What is "phlegm"?

phlegm

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The sinus is a hollow space located in the facial bones of the skull. It is lined with a mucous membrane and serves various functions, such as producing mucus, reducing the weight of the skull, and enhancing the resonance of our voice. When the sinus becomes inflamed or congested, it can lead to sinusitis, which is characterized by symptoms like nasal congestion, facial pain, and headaches. Proper sinus health is important for maintaining clear breathing and overall well-being.

What is "sinus"?

sinus

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A lobe refers to a distinct and often rounded subdivision or projection of an organ or structure. Lobes can be found in various organs, such as the brain, lungs, liver, and ears. They are typically demarcated by anatomical landmarks or divisions and serve specific functions within the organ they belong to. For example, in the brain, the cerebral hemispheres are divided into frontal, parietal, temporal, and occipital lobes, each associated with different cognitive and sensory functions. Similarly, in the lungs, lobes are responsible for the exchange of gases and are further divided into lobules. Lobes play a vital role in the organization, function, and specialization of different organs, contributing to the overall complexity and efficiency of the human body.

What is a "lobe"?

lobe

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The cortex, also known as the neocortex, is a highly complex and layered structure that forms the outer surface of the brain. It is composed of billions of neurons and is responsible for many essential functions such as conscious awareness, perception, voluntary movement, and higher-level cognitive processes. The cortex is divided into different regions, each with specialized functions, such as the frontal lobe involved in executive functions and decision-making, the parietal lobe involved in sensory processing, the temporal lobe involved in memory and auditory processing, and the occipital lobe involved in visual processing. The intricate organization of the cortex allows for intricate connections and information processing, making it a critical component of the central nervous system.

What is "cortex"?

cortex

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The iris, a thin circular structure in the eye, contains pigments that give it color and helps control the amount of light that enters the eye through the pupil. It acts like a diaphragm, expanding or contracting to adjust the size of the pupil and regulate the amount of light reaching the retina. The unique pattern and color of the iris are used for identification purposes, making each person's iris distinct and individual.

What is "iris"?

iris

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The retina, located at the back of the eye, is a thin, light-sensitive layer that plays a crucial role in vision. It contains specialized cells called photoreceptors, including rods and cones, which convert light into electrical signals. These signals are then transmitted to the brain through the optic nerve, where they are processed and interpreted as visual information. The retina's intricate structure and arrangement of photoreceptor cells enable the perception of colors, shapes, and details, forming the foundation of visual perception. It acts as a vital sensory component, allowing us to see and perceive the world around us.

What is "retina"?

retina

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The cornea is the transparent, dome-shaped layer at the front of the eye that covers the iris and pupil. It plays a crucial role in refracting and focusing light onto the retina, allowing us to see clearly. The cornea is composed of specialized cells and is responsible for most of the eye's focusing power. It is essential for maintaining the integrity of the eye and protecting it from external elements.

What is "cornea"?

cornea

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The eardrum, also known as the tympanic membrane, is a thin, cone-shaped membrane located in the middle ear. It separates the outer ear from the middle ear and plays a crucial role in the process of hearing. When sound waves enter the ear, they cause the eardrum to vibrate, which in turn transmits these vibrations to the bones of the middle ear, allowing sound to be amplified and transmitted further into the inner ear for processing.

What is "eardrum"?

eardrum

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The trunk refers to the central part of the body between the neck and the pelvis, encompassing the chest, abdomen, and back. It serves as a foundational structure that houses and protects vital organs such as the heart, lungs, liver, stomach, and intestines. The trunk plays a crucial role in supporting the body's posture, balance, and movement. It also contains various muscles, including the core muscles, which provide stability and assist in activities such as bending, twisting, and lifting. The trunk is integral to overall bodily function and serves as a connection point for the upper and lower extremities, facilitating coordinated movement and physical performance.

What is "trunk"?

trunk

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Bile is a digestive fluid produced by the liver and stored in the gallbladder in the human body. It plays a critical role in the digestion and absorption of fats. Bile is composed of water, bile salts, cholesterol, bilirubin, and other substances. It is released into the small intestine during the digestion process, where it helps break down fats into smaller molecules for better absorption. Additionally, bile aids in the elimination of waste products, particularly the removal of bilirubin, a byproduct of red blood cell breakdown. Its efficient production and secretion are essential for proper digestion and the overall health of the digestive system.

What is "bile"?

bile

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The pancreas is a gland located in the abdomen, behind the stomach. It serves both digestive and endocrine functions in the body. As a digestive gland, the pancreas produces enzymes that help break down carbohydrates, proteins, and fats in the small intestine. These enzymes aid in the digestion and absorption of nutrients from food. Additionally, the pancreas produces hormones, including insulin and glucagon, which regulate blood sugar levels and play a critical role in metabolism. The pancreas is an essential organ for maintaining proper digestion and glucose regulation in the body.

What is "pancreas"?

pancreas

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The spleen is a large organ located in the upper left abdomen. It serves as a vital part of the immune system, playing multiple roles in the body's defense against infections. The spleen acts as a filter for the blood, removing old or damaged red blood cells and capturing and destroying bacteria, viruses, and other foreign substances. Additionally, the spleen stores and produces white blood cells and platelets, which are crucial for fighting infections and maintaining healthy blood circulation. It also plays a role in the production of antibodies and the removal of cellular debris. The spleen is an essential organ for immune function and overall health.

What is "spleen"?

spleen

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The colon, also known as the large intestine, is a vital part of the human digestive system. It is a long, hollow tube-like organ located in the abdominal cavity. The primary function of the colon is to absorb water, electrolytes, and nutrients from digested food and eliminate waste material from the body. It plays a crucial role in the final stages of digestion and the formation of feces. The colon consists of several segments, including the ascending colon, transverse colon, descending colon, and sigmoid colon, which collectively aid in the process of food digestion and waste elimination.

What is "colon"?

colon

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The pelvis refers to the bony structure located at the base of the spine, between the abdomen and the lower limbs. It consists of the sacrum, coccyx, and two hip bones, which fuse together to form a sturdy basin-like structure. The pelvis provides support and stability to the spinal column and acts as a foundation for the weight-bearing structures of the body. It protects internal organs within the pelvic cavity, such as the bladder, reproductive organs, and part of the digestive system. The pelvis also serves as a crucial attachment site for various muscles involved in movement, particularly those related to the hips and thighs. Its structure and function are essential for proper posture, locomotion, and reproductive processes.

What is "pelvis"?

pelvis

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The cervix is a narrow, cylindrical structure located at the lower end of the uterus in the female reproductive system. It serves as the gateway between the uterus and the vagina. The cervix plays multiple roles, including allowing the passage of menstrual blood during menstruation, providing a channel for sperm to enter the uterus during sexual intercourse, and acting as a protective barrier to prevent infections from reaching the uterus. It also undergoes changes during pregnancy, helping to support the developing fetus and eventually opening up during childbirth to allow the baby to pass through.

What is "cervix"?

cervix

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The urethra is a vital part of the urinary system in both males and females. In males, it serves a dual function, acting as a conduit for both urine and semen. In females, the urethra is shorter and solely responsible for the passage of urine. It plays a crucial role in the elimination of waste products from the body and is essential for maintaining proper urinary function and control.

What is "urethra"?

urethra

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Bone marrow is a soft, spongy tissue found within certain bones, primarily in the center of long bones and the cavities of flat bones. It is responsible for the production and development of blood cells, including red blood cells, white blood cells, and platelets. Bone marrow contains stem cells, which differentiate and mature into specialized blood cells to support various bodily functions, such as oxygen transport, immune response, and blood clotting. Additionally, bone marrow serves as a storage site for fat cells and plays a role in the body's immune system. Disorders affecting bone marrow can impact blood cell production and overall health, making it a crucial component of the body's hematopoietic system.

What is "bone marrow"?

bone marrow

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The esophagus is a muscular tube connecting the throat to the stomach in the human body. It serves as a passage for food and liquids to travel from the mouth to the stomach during the process of swallowing. The walls of the esophagus contract in coordinated movements, known as peristalsis, to push the food downward. The esophagus also contains a sphincter at its lower end, called the lower esophageal sphincter, which helps prevent stomach acid and contents from flowing back into the esophagus. Its role in facilitating the safe and efficient transport of food makes the esophagus an essential component of the digestive system.

What is "esophagus"?

esophagus

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The epidermis is the outermost layer of the skin, serving as a protective barrier between the body and the external environment. It consists of several layers of cells and plays a crucial role in regulating temperature, preventing water loss, and shielding the body from harmful substances and pathogens. The epidermis also contains melanocytes, which produce melanin, the pigment responsible for skin color.

What is "epidermis"?

epidermis

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The Achilles tendon is a singular fibrous band that connects the calf muscles, specifically the gastrocnemius and soleus muscles, to the heel bone (calcaneus). It is the thickest and strongest tendon in the human body. The Achilles tendon plays a crucial role in the movement of the foot and lower leg, particularly during activities such as walking, running, and jumping. It enables the extension of the foot and assists in the propulsion of the body forward. Due to its location and function, the Achilles tendon is prone to injury, such as Achilles tendonitis or a rupture, which can significantly impact mobility and athletic performance.

What is "Achilles tendon"?

Achilles tendon

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The femur is the largest bone in the human body. It is located in the thigh region and extends from the hip joint to the knee joint. The femur is a weight-bearing bone that provides structural support and stability to the lower body. It plays a critical role in walking, running, and various lower limb movements. The femur's unique shape and composition allow for the attachment of numerous muscles involved in hip and knee movements. As a crucial component of the skeletal system, the femur not only supports the body's weight but also protects the underlying structures, such as blood vessels and nerves, while facilitating efficient and coordinated leg movements.

What is "femur"?

femur

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The scapula, commonly known as the shoulder blade, is a flat, triangular bone that connects the upper arm bone (humerus) to the collarbone (clavicle). The scapula plays a crucial role in the movement and stability of the shoulder joint. It provides attachment points for various muscles involved in arm and shoulder movements, such as lifting, pushing, and pulling. The scapula's mobility and position allow for a wide range of shoulder motions, including rotation, abduction, and adduction. It also serves as a protective shield for the underlying structures, including the lungs and part of the ribcage. The scapula's presence and proper functioning are integral to the overall strength, stability, and functionality of the shoulder complex.

What is "scapula"?

scapula

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renal

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intestinal

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Canines, also called canine teeth, are sharp, pointed teeth located on each side of the incisors. Also known as "eye teeth" or "cuspid teeth," canines are crucial for biting and tearing food. They have long roots and a more pronounced shape compared to other teeth, giving them a prominent appearance. Canines are part of both the primary (baby) and permanent dentitions, and they play a significant role in maintaining the proper alignment and occlusion of the jaw. Additionally, canines contribute to the aesthetic appeal of a person's smile.

What is "canine"?

canine

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Here you will learn all the essential words for talking about Human Body, collected specifically for level C2 learners.

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