heart

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A toe is one of the five digits on the foot, located at the end of the foot opposite the heel. It plays a crucial role in maintaining balance and providing support during standing, walking, and running. Each toe consists of bones, joints, muscles, and ligaments that enable movements such as flexion, extension, and gripping. The toes also help with propulsion and shock absorption during walking, distributing the body's weight evenly. Understanding the anatomy and function of the toes is important for proper foot mechanics, stability, and overall lower limb health.

What is a "toe"?

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The brain is the complex and intricate organ that serves as the center of the nervous system in all vertebrate and most invertebrate animals. It controls and coordinates all bodily functions, including sensory perception, motor activity, thought, and emotion. The brain is made up of billions of interconnected neurons that communicate with each other through electrical and chemical signals, forming neural networks that enable learning, memory, and cognitive processes. It is protected by the skull and nourished by the circulatory system, and its proper functioning is essential for maintaining health and survival.

What is "brain"?

brain

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The knee is a joint connecting the thigh bone (femur) to the shin bone (tibia). It is a hinge joint that allows for the bending and straightening of the leg. The knee is supported by ligaments, tendons, and muscles that provide stability and enable various movements such as walking, running, and jumping. It acts as a shock absorber and plays a crucial role in weight-bearing activities. The knee joint is essential for overall lower limb function and mobility, and understanding its anatomy and function is important for maintaining proper knee health and preventing injuries.

What is "knee"?

knee

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The lung refers to paired, spongy organs located in the chest cavity that play a crucial role in respiration. They are responsible for the exchange of oxygen and carbon dioxide between the air and the bloodstream, enabling the body to receive oxygen and remove waste gases. The lungs are composed of numerous air sacs called alveoli, which provide a large surface area for efficient gas exchange.

What is "lung"?

lung

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A muscle is a body part responsible for generating movement and providing mechanical support to the body. Composed of contractile fibers, muscles enable the execution of various actions, such as walking, lifting, and even the beating of the heart. Through the process of muscle contraction and relaxation, they exert force on bones and other tissues, allowing for coordinated and controlled motion. Muscles are essential for maintaining posture, facilitating bodily functions, and enabling physical activities.

What is a "muscle"?

muscle

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shoulder

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ankle

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The wrist is a complex joint located between the hand and the forearm, allowing for movement and flexibility. It consists of multiple small bones called carpal bones, along with ligaments, tendons, and nerves. The wrist enables various motions such as flexion, extension, abduction, and adduction, facilitating activities like grasping, gripping, and manipulating objects. It plays a crucial role in fine motor skills and is essential for many daily tasks. Understanding the anatomy and function of the wrist is important for maintaining its stability, preventing injuries, and ensuring optimal hand and arm functionality.

What is "wrist"?

wrist

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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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A bone is a hard, dense tissue that forms the structural framework of the body. It provides support, protection, and mobility for various body parts. Bones are made up of calcium, phosphorus, and other minerals, giving them strength and durability. They also contain bone marrow, where blood cells are produced. Bones come in various shapes and sizes and are interconnected to form the skeleton, which serves as the body's framework.

身体部位与器官