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BiologyApril18th2007 - enable them to pump blood throughout...

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Dustin Lee 30.2: q1-4 Block C: Biology 1. Starting with the right ventricle: right ventricle, pulmonary valve, right pulmonary artery, capillaries of right and left lung, right and left pulmonary vein, left atrium, left atrioventricular valve, left ventricle, aortic valve, aorta, artery of upper and lower body, capillaries of upper and lower body, vein from upper and lower body, right atrium, right atrioventricular valve 2. The two upper chambers, which receive blood returning to the heart, are called atria. The two lower chambers are called ventricles, which pump blood out of the heart. The atria, which pump blood a short distance into the ventricles, have fairly thin walls. Ventricles have thicker muscular walls that
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Unformatted text preview: enable them to pump blood throughout the body. 3. A specific region of the heart muscle is the pacemaker. The pacemaker sets the rate at which your heart contracts. It generates electrical impulses that spread rapidly over the walls of both atria, making them contract. The impulses then spread to a region of the heart called the AV node. From there, the electrical impulses spread to the ventricles, causing them to contract. The contracting ventricles propel blood to the rest of the body. 4. Systolic pressure is the highest recorded pressure in an artery when the ventricles contract. Diastolic pressure is the lowers recorded pressure in an artery during the relaxation phase of the heartbeat....
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