• protects deeper organs from mechanical, chemical and bacterial injury and drying out
• excretes salts and urea
• aids in regulation of body temp
• produces vit D

• primary function is to contract or shorten; in doing so skeletal muscles allow locomotion (running,walking, etc.), grasping and manipulation of the environment,and facial expression
• generates heat

• primary function is to contract or shorten; in doing so, skeletal muscles allow locomotion (running, walking, ect.) grasping manipulation of the enviroment, and facial expression
• generates heat 

muscles attached to the skeleton 

• Allows body to detect changes in its internal and external environment and to respond to such information by activating appropriate muscles or glands
• helps maintain homeostasis of the body via rapid transmission of electrical signals 

pituitary, thymus, thyroid, parathyroid,adrenal,and pineal glands; ovaries, testes and pancreas

heart,blood vessels, and blood

• primarily a transport system that carries blood containing oxygen, carbon dioxide, nutrients, wastes, ions, horomones and other substances to and from tissue cells where exchanges are made;blood is propelled through the blood vessels by the pumping action of the heart
• antibodies and other protein molecules in the blood protect the body

• picks up fluid leaked from teh blood vessels and returns it to the blood 'cleanes blood of pathogens and other debris
• houses lymphocytes that act via the immune response to protect the body from foreign substances 

keeps the blood continususly supplied with oxygen while removing carbon dioxide

contributes to the acid-base balance of the blood via its carbonic acid-bicarbonate buffer system

kidneys, ureters, bladder, and urethra

• rids the body of nitrogen containing wastes including urea, uric acid, and ammonia, which result from the breakdown of proteins and nucleic acids
• maintains water, electrolyte, and acid-base balance of the blood

• Male: testes, prostate gland, scrotum, penis, and duct system, which carries sperm to the body exterior
• Female: ovaries, uterine tubes, uterus, mammary glands, and vagina 

Male: provides germ cells callled sperm for perpuation of the species

Female:provides germ cells called eggs;the female uterus houses the developing fetus until birth; mammary glands provide nutrition for the infant