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largest organ in your body.


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.


secrete sweat produced in sweat glands to cool the body.


allow you to breathe in oxygen and breathe out carbon dioxide. Cells need oxygen to function. (made of connective and epithelial tissue.)


a group of tissues that is organized and works together to perform a specific function.


an air sac. to increase the surface area for efficient exchange of oxygen and carbon dioxide.


tiny thin walled blood vessels surrounding the alveoli.


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.

right atria and right ventricle

pumps blood to the lungs so that the blood can pick up oxygen.

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)


churns food and mixes it with digestive juices and enzymes


areas of chemical digestion and removal of wastes.


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


• transports water and nutrients throughout the plant • supports the leaves and flowers.


main function is to produce seeds through sexual reproduction.


carry oxygenated blood away from the heart to tissues that need it.


return deoxygenated blood to the heart.


The maintenance of constant internal conditions despite a changing external environment . (Organ systems working together)

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