The skeleton is the framework that supports the body and protects the internal organs. Adult human beings have over 200 bones. Muscular System Muscles perform a variety of functions within the body. This system comprises all the organs involved in consuming food and converting its useful elements into chemical substances the body can use. Respiratory System Respiration, or breathing, brings oxygen to the lungs where it is dispersed to the blood cells.
Carbon dioxide is expelled from the lungs with each exhalation.
The endocrine glands produce hormones, or chemical messengers, that are carried to all parts of the body. The word integument means skin. The skin is considered by some to be a separate body system. It includes the skin, hair, nails, and the sweat and oil glands. Some anatomy terms are based on a resemblance of the structure to some familiar object.