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Unformatted text preview: mpathetic nervous system increases heart rate during times of stress. The parasympathetic division
slows heart rate during times of rest.
• Mammalian blood circulation:
• Deoxygenated blood arrives from the body through the superior and inferior vena cavae.
• Deoxygenated blood enters the right atrium, then moves to the right ventricle.
• Deoxygenated blood leaves the heart through the pulmonary arteries and goes to the lungs.
• In the lungs, the blood gives up carbon dioxide and takes up oxygen.
• Oxygenated blood travels from the lungs to the heart through the pulmonary veins.
• Oxygenated blood enters the right atrium, and moves into the right ventricle.
• Oxygenated blood leaves the heart through the aorta and is carried to the body.
• Students often learn that arteries carry oxygenated blood and veins carry deoxygenated blood. However,
the pulmonary arteries and veins reverse this notion. It is better to remember that arteries carry blood away
from the heart and veins carry blood to the heart.
• Common use of the word...
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- Winter '09