17 Organs

The organ level of organization in the body may be the most familiar to us from our everyday experiences. Many of the common ailments we hear about—an upset stomach, a broken bone, lung disease, skin cancer—are named for the organs they affect.

An organ is made up of tissues that work together to perform a specific function for the body as a whole. Groups of organs that perform related functions are organized into organ systems, which perform more general functions. The table below describes the structures and functions of some common organs.

Table 1: Organs, Functions, Tissues, and Systems Parts
Organ Primary function(s) Tissues it contains Organ system(s) it is a part of
brain control of body systems and behavior; cognition nervous, connective, epithelial nervous system; endocrine system
skin protection; support and containment; temperature and fluid regulation epithelial, nervous, connective, muscular integumentary system
stomach chemical and mechanical digestion of food epithelial, connective, muscular, nervous digestive system
sternum (breastbone) support; protection; blood cell production epithelial, connective, nervous skeletal system; immune system; cardiovascular system
kidney waste removal; fluid regulation epithelial, connective, nervous urinary system


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