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  2. Water - Wikipedia

    en.wikipedia.org/wiki/Water

    All known forms of life depend on water. Water is vital both as a solvent in which many of the body's solutes dissolve and as an essential part of many metabolic processes within the body. Metabolism is the sum total of anabolism and catabolism. In anabolism, water is removed from molecules (through energy requiring enzymatic chemical reactions ...

  3. Human body - Wikipedia

    en.wikipedia.org/wiki/Human_body

    The human body is composed of elements including hydrogen, oxygen, carbon, calcium and phosphorus. These elements reside in trillions of cells and non-cellular components of the body. The adult male body is about 60% water for a total water content of some 42 litres (9.2 imp gal; 11 US gal).

  4. Body water - Wikipedia

    en.wikipedia.org/wiki/Body_water

    Body water. In physiology, body water is the water content of an animal body that is contained in the tissues, the blood, the bones and elsewhere. The percentages of body water contained in various fluid compartments add up to total body water (TBW). This water makes up a significant fraction of the human body, both by weight and by volume.

  5. List of systems of the human body - Wikipedia

    en.wikipedia.org/wiki/List_of_systems_of_the...

    cardiovascular system. endocrine system. (missing exocrine system) muscular system. Clockwise from top left: lymphatic system. respiratory system. urinary system. female reproductive system. male reproductive system.

  6. Water vascular system - Wikipedia

    en.wikipedia.org/wiki/Water_vascular_system

    The water vascular system is a hydraulic system used by echinoderms, such as sea stars and sea urchins, for locomotion, food and waste transportation, and respiration. [1] The system is composed of canals connecting numerous tube feet. Echinoderms move by alternately contracting muscles that force water into the tube feet, causing them to ...

  7. Organ system - Wikipedia

    en.wikipedia.org/wiki/Organ_system

    There are 11 distinct organ systems in human beings, [2] 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 ...

  8. List of organs of the human body - Wikipedia

    en.wikipedia.org/wiki/List_of_organs_of_the...

    Explanation of the levels in the human body; defines the column labels in the next table. Level Definition Organ systems A biological system consisting of a group of organs that work together to perform one or more functions. Organ sub-systems A biological system consisting of a group of organs that work together to perform just one function.

  9. Hydrostatic skeleton - Wikipedia

    en.wikipedia.org/wiki/Hydrostatic_skeleton

    As a skeletal structure, a hydroskeleton possesses the ability to affect shape and movement, and involves two mechanical units: the muscle layers and the body wall. The muscular layers are longitudinal and circular, and part of the fluid-filled coelom within. Contractions of the circular muscles lengthen the organism's body, while contractions ...

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