forms the external body covering, and protects deeper tissues from injury. Synthesizes vitamin D, and houses cutaneous receptors (pain, pressure, ect) and sweat and oil glands
muscular system
allows manipulation of the environment locomotion, and facial expression. maintains posture and produces heat
respiratory system
keeps blood constantly supplied with oxygen and removes carbon dioxide. the gaseous exchanges occur through the walls of the air sacs of the lungs
urniary system
eliminates nitrogenous wastes from the body. regulates water, electrolyte and acid-base balance of the blood
lymphatic system/immunity
picks up fluid leaked from blood vessels and returns it to blood. disposes of debris in the lymphatic stream. houses white blood cells (lymphocytes) involved in immunity. the immune response mounts the attack against foreign substances within the body
reproductive system
produces sex cells, allows transfer of sex cells and fertilization to occur, permits development and birth of offspring, nourishes offspring, and produces sex hormones.
nervous system
as the fact-acting control system of the body it responds to internal and external changes by activating appropriate muscles and glands
digestive system
breaks down food into absorable units that enter the blood for distribution to body cells. indigestible foodstuffs are eliminated as feces
cardiovascular system
blood vessels transport blood which carries oxygen, carbon dioxide, nutrients, wastes, ect. the heart pumps blood
skelatal system
protects and supports body organs and provides a framework the muscles use to cause movement. blood cells are formed within bones. bones store minerals
