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The Human Body (Cells (Cells are the basic units of structure and function…

- - - - Stem Cells are an undifferentiated cells of a multicellular organism that is capable of giving rise to indefinitely more cells of the same type, and from which certain other kinds of cell arise by differentiation.
- - - - Heart is a pump for the movement of blood through the body.
    - - Lungs help oxygen from the air we breathe enter the red cells in the blood.
    - - Kidneys extract waste from blood, balance body fluids, and form urine
- - - - Excretory system: A low level of water in the blood triggers retention of water by the kidneys. The kidneys produce more concentrated urine, so less water is lost from the body.
      - Endocrine system: A high concentration of sugar in the blood triggers secretion of insulin by an endocrine gland called the pancreas. Insulin is a hormone that helps cells absorb sugar from the blood.
      - Respiratory system: A high concentration of carbon dioxide in the blood triggers faster breathing. The lungs exhale more frequently, which removes carbon dioxide from the body more quickly.