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the outer protective layer that is made up of epithelial tissue. (prevents bacteria and viruses from entering your body.)
inner layer of the skin and is made up of connective tissue, nervous tissue, and muscle tissue.
allow you to breathe in oxygen and breathe out carbon dioxide. Cells need oxygen to function. (made of connective and epithelial tissue.)
an air sac. to increase the surface area for efficient exchange of oxygen and carbon dioxide.
organ that moves blood throughout the body. It is divided into 4 chambers - left and right atria (or atrium), and the left and right ventricles.
left atria and ventricle
pumps the oxygenated blood from the lung through the aorta to the rest of the body.
food travels down because of the rhythmic constriction and relaxation of the smooth muscles that line the tube. (peristalsis)
anchor the plant in the soil, collect water from the surrounding soil, and store food made in other parts of the plant.
chemical reaction in which carbon dioxide and water are converted into sugar and oxygen
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