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  2. Organ system - Wikipedia

    en.wikipedia.org/wiki/Organ_system

    Nervous system in a human body. There are 11 distinct organ systems in human beings, which form the basis of human anatomy and physiology.The 11 organ systems: the respiratory system, digestive and excretory system, circulatory system, urinary system, integumentary system, skeletal system, muscular system, endocrine system, lymphatic system, nervous system, and reproductive system.

  3. Human skeleton - Wikipedia

    en.wikipedia.org/wiki/Human_skeleton

    Human skeleton. The human skeleton is the internal framework of the human body. It is composed of around 270 bones at birth – this total decreases to around 206 bones by adulthood after some bones get fused together. [1] The bone mass in the skeleton makes up about 14% of the total body weight (ca. 10–11 kg for an average person) and ...

  4. Category:Animal anatomy - Wikipedia

    en.wikipedia.org/wiki/Category:Animal_anatomy

    Anatomical terms of location. Animal reflectors. Animal tooth development. Annulus (zoology) Appendage. Aquatic macroinvertebrate DNA barcoding. Armour (zoology) Articular capsule of the knee joint. List of animals featuring external asymmetry.

  5. Bird anatomy - Wikipedia

    en.wikipedia.org/wiki/Bird_anatomy

    Most birds have approximately 175 different muscles, mainly controlling the wings, skin, and legs. Overall, the muscle mass of birds is concentrated ventrally. The largest muscles in the bird are the pectorals, or the pectoralis major, which control the wings and make up about 15–25% of a flighted bird's body weight.

  6. Exoskeleton - Wikipedia

    en.wikipedia.org/wiki/Exoskeleton

    Exoskeleton. An exoskeleton (from Greek έξω éxō "outer" [1] and σκελετός skeletós "skeleton" [2] [3]) is a skeleton that is on the exterior of an animal in the form of hardened integument, which both supports the body's shape and protects the internal organs, in contrast to an internal endoskeleton (e.g. that of a human) which is ...

  7. Respiratory system - Wikipedia

    en.wikipedia.org/wiki/Respiratory_system

    The respiratory system (also respiratory apparatus, ventilatory system) is a biological system consisting of specific organs and structures used for gas exchange in animals and plants. The anatomy and physiology that make this happen varies greatly, depending on the size of the organism, the environment in which it lives and its evolutionary ...

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