The Heart Your heart is about the same size as your fist. An adult’s heart is about two fists. An average adult body contains about five quarts of blood. All the blood vessels in the body joined end to end would stretch 62,000 miles or two and a half times around the earth. The heart circulates the body's blood supply about 1,000 times each day. The heart pumps the equivalent of 5,000 to 6,000 quarts of blood each day.

http://www.kscience.co.uk/animations/hea rt.swf

Blood flow in the Heart Blood from the body flows: Deoxygenated blood enters the heart through the superior and inferior vena cava, then flows into the right atrium Goes through the tricuspid valve to the right ventricle Gets pumped through the pulmonary valve to the pulmonary artery to the lungs

The blood picks up oxygen in the lungs, and then flows from the lungs: Through the pulmonary veins Into the left atrium Flows through the mitral valve Into the left ventricle Flows through the aortic valve Into the aorta and pumped to the body

Fill in worksheet during the next two videos/ websites http://www.smm.org/heart/heart/in- out.htm interactive model http://www.makingsenseofhealth.org.uk/gf x/library/resources/HA2_VC.wmv disection

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