the body's organ systems and their major functions

skeletal system

• protects and supports body organs

• provides a framework the muscles use to cause movement

• blood cells formed within bones

integumentary

• forms external body covering

• protects deeper tissues from injury

• synthesizes vitamin D

• house cutaneous receptors, sweat and oil glands

muscular

• allows manipulation of environment, locomotion, and facial expression

• maintains posture, and produces heat

nervous

• fast acting control system of the body

endocrine

• glands secrete hormones that regulate processes

cardiovascular system

• blood vessels transport blood which carries oxygen, carbon dioxide, nutrients, wastes

lymphatic/immunity system

• picks up leaked fluid from blood vessels and returns it to blood

• disposes of debris in lymphatic stream

• houses lymphocytes (white blood cells) involved in immunity

respiratory

• keeps blood constantly supplied with oxygen and removes carbon dioxide occurs through walls of air sacs of the lungs

digestive

• breaks down food into absorbable units that enter blood for distribution to body cells

urinary

• eliminates nitrogenous wastes from body

• regulates water, electrolyte, and acid base balance of the blood

male reproductive system

• testes produce sperm and male sex hormone

• male ducts and glands aid in delivery of sperm to the female reproductive tract

female reproductive system

• ovaries produce eggs and female sex hormones

• mammary glands in breast produce milk to nourish new born

• female structures serve as sites for fertilization and development of the fetus