responds to stimuli in the environment, and controls most body functions

carry oxygen-poor blood back to the heart

smallest branches of the bronchi

contain oxygen-poor blood

part of the blood that helps destroy bacteria and fight disease

works with the skeletal system to allow the body to move

smallest blood vessel; brings nutrients and oxygen to the tissues and absorbs carbon dioxide and waste products

protects the body, releases excess water in sweat, and helps regulate body temperature

transports nutrients, gas, and waste to the body; gives blood it's color

closely related to the immune system; helps fight viruses, germs, and diseases

carries needed materials to the body cells, including oxygen; carries waste away from the body, including carbon dioxide

heart, arteries, capillaries, veins, blood, white blood cells

produces sex cells that can unite with other sex cells to create offspring

carry oxygen-rich blood away from the heart to other parts of the body

contain oxygen-rich blood

removes waste products from the body

Liquid part of blood, made mostly of water, salt, sugar, and protein

gives the body structure and protects internal organs

nose, trachea, larynx, bronchi, lungs, alveoli, diaphragm

small air sacs in the lungs where oxygen and carbon dioxide are exchanged

large, flat muscle at the bottom of the chest cavity that helps with breathing; when it is contracted oxygen is inhaled, and when it is relaxed carbon dioxide is exhaled