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Circulatory System PARTS PAGE 487 - 496 Parts of the Circulatory System Heart: Blood vessels: Arteries: Veins: Capillaries: Parts of the Circulatory System Two-circuit Blood system: goes to: Lungs: Body cells: Parts of the Circulatory System More than a two-circuit system? Blood also goes to: Digestive Liver: Kidney: system: Blood vessels Circulatory System: Arteries Carry blood away from heart Blood Aorta: Splits can be oxygen-rich or oxygen-poor largest artery that leaves the heart into the ascending and descending branches Circulatory System: Arteries Structure: 3 layers: 1. 2. 3. Why is it designed to be slightly elastic? Circulatory System: Arteries Arterioles: smallest artery that still contains smooth muscle Circulatory System: Arteries Arterioles: smooth muscle under control of nervous system Vasoconstriction: Vasodilation: Used to regulate body temperature by controlling blood flow to the skin Circulatory system: Capillaries Very small vessels that branch out from arterioles Forms an extensive network that moves through all body tissues At their smallest, only one blood cell is able to move through at a time Circulatory system: Capillaries Circulatory system: Capillaries Blood flow slows in the capillaries The extensive branching increases the area the blood must flow through Slowed blood gives it more time to exchange materials with cells Blood flow can also be controlled by small sphincter muscles located at beginning of capillaries Circulatory system: Veins After blood passes capillaries it moves through venules before entering the veins Deoxygenated How and carrying waste products is it similar and different from the artery Circulatory system: Veins Blood How pressure much lower in veins does blood get back to the heart? Valves? Circulatory system: Veins Blood pressure The pressure exerted on the blood to move through the body by the contractions of the heart Systolic pressure: Diastolic pressure: Blood pressure Homework: For THURSDAY Read pages 495-497 Draw a diagram of the heart with: Chambers Valves Entering Create and exiting vessels a flow chart detailing the flow of blood as it moves through the heart, lungs, and body