Glands secrete hormones that regulate processes such as growth, reproduction, and nutrient use (metabolism) by body cells.
Back
respiratory system
Front
Keeps blood constantly supplied with oxygen and removes carbon dioxide. The gaseous exchanges occur through the walls of the air sacs of the lungs.
Back
digestive system
Front
Breaks down food into absorbable units that enter the blood for distribution to body cells. Indigestible foodstuffs are eliminated as feces.
Back
urinary system
Front
Eliminates nitrogenous wastes from the body. Regulates water, electrolyte and acid-base balance of the blood.
Back
integumentary system
Front
Forms the external body covering, and protects deeper tissues from injury. Synthesizes vitamin D, and houses cutaneous (pain, pressure, etc.) receptors and sweat and oil glands.
Back
nervous system
Front
fast-acting control system of the body; responds to internal and external changes by activating appropriate muscles and glands
Back
reproductive system
Front
Overall function is the production of offspring.
Back
skeletal system
Front
Protects and supports body organs and provides a framework the muscles use to support movement. Blood cells are formed within bones; stores minerals.
Back
cardiovascular system
Front
Blood vessels transport blood, which carries oxygen, carbon dioxide, nutrients, wastes, etc. The heart pumps blood.
Back
lymphatic system
Front
Picks up fluid leaked from blood vessels and returns it to blood. Disposes of debris in the lymphatic stream. Houses white blood cells involved in immunity.
Back
Muscular System
Front
Allows manipulation of the environment, locomotion, and facial expression. Maintains posture, and produces heat.