These tiny hairs cover the inside of the lungs.

to maintain a stable internal environment

The major organ of the respiratory system

trachea, bronchus, bronchioles, alveoli, lungs are

Tiny air sacs where oxygen enters the blood and carbon dioxide leaves the blood (gas exchange)

Muscle under lungs that allows you to breathe involuntarily.

Windpipe

voice box

Circulatory System Function

muscular bottom chamber of heart that pushes blood through the whole body under high pressure

major organ of the circulatory/cardiovascular system made of cardiac muscle and connective tissues

delivers oxygen and nutrients to all the cells of the body (picks up CO2 waste)

smallest blood vessels in your body, only 1 cell thick.

blood vessels that direct blood away from the heart

liquid connective tissue whose cells deliver oxygen, pick up waste and fight disease

White blood cells

another word for circulatory

3 parts of the cardiovascular system

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