Organ system

In biology, an organ system is a group of organs that work together to perform one or more functions. Each does a particular job in the body, and is made up of certain tissues.

Organs and their functions

These specific systems are widely studied in anatomy. They are present in many types of animals.




  • Endocrine system: communication within the body using hormones made by endocrine glands such as the hypothalamus, pituitary gland, pineal gland, thyroid, parathyroid and adrenal glands.
  • Lymphatic system: the transfer of lymph between tissues and the blood stream; includes the lymph and the nodes and vessels. Includes the functions of immune responses and the development of antibodies.


  • Nervous system: collecting, transferring and processing information with brain, spinal cord, peripheral nervous system and sense organs.
  • Muscular system: allows for manipulation of the environment, provides locomotion, maintains posture, and produces heat. Includes skeletal muscles, smooth muscles and cardiac muscle.


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