Blood Vessels

MATERIALS NEEDED

textbook compound microscope prepared microscope slides: artery cross section vein cross section live frog frog Ringer's solution paper towel rubber bands frog board or heavy cardboard (with a 1-inch hole cut in one corner) dissecting pins thread masking tape

For Optional Activity:

ice hot plate thermometer

SAFETY

• Wear disposable gloves when handling the live frogs.

• Return the frogs to the location indicated after the experiment.

• Wash your hands before leaving the laboratory.

The blood vessels form a closed system of tubes that carry blood to and from the heart, lungs, and body cells. These tubes include arteries and arterioles that conduct blood away from the heart; capillaries in which exchanges of substances occur between the blood and surrounding tissues; and venules and veins that return blood to the heart.

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