A system is a combination of parts or organs, which, in association, perform some particular function. The systems of the body are as follows:
a. Integumentary. Covers and protects the body from drying, injury, and infection, and has functions of sensation, temperature regulation, and excretion.
b. Skeletal. Provides a framework for the body, supports the organs, and furnishes a place of attachment for muscles.
c. Muscular. Provides the force for the motion and propulsion of the body.
d. Respiratory. Absorbs oxygen from the air and gives off the carbon dioxide produced by the body tissues.
e. Cardiovascular. Functions in the transportation of blood throughout the body.
f. Lymphatic (System of Vessels and Glands). Returns protein and fluid to the blood from the various body tissues; also furnishes the body with protective mechanisms against pathogenic organisms.
g. Gastrointestinal. Digests and absorbs food substances and excretes waste products.
h. Genitourinary. Excretes and transports urine (urinary), and elaborates and transports reproductive cells and sex hormones (reproductive).
i. Nervous and Special Senses. Gives the body awareness of its environment, and enable it to react to that environment.
j. Endocrine. Manufactures hormones, which are active in the control of much of the body activity and behavior.
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