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Circulatory System

Circulatory System. Blood Vessels. Series of interconnecting tubes that transport blood to all parts of your body. Arteries. Carry blood away from the heart Have elastic walls made of smooth muscle that can stretch and narrow to change diameter of artery.

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Circulatory System

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  1. Circulatory System

  2. Blood Vessels • Series of interconnecting tubes that transport blood to all parts of your body.

  3. Arteries • Carry blood away from the heart • Have elastic walls made of smooth muscle that can stretch and narrow to change diameter of artery. • Branch into smaller arteries called arterioles.

  4. Vasoconstriction • Narrowing of blood vessels • Decreases blood flow to body tissues.

  5. Vasodilation • Widening of the blood vessels • Increases blood flow to body tissues.

  6. Arteriosclerosis • Refers to a group of disorders involved with clogged or narrowed blood vessels.

  7. 3 Types of Arteriosclerosis • Atherosclerosis • Myocardial infarction (heart attack) • Aneurysm

  8. Using your textbook explain in detail each disorder from the previous slide.

  9. Hemorrhage • Refers to the loss of blood from the circulatory system. • Blood enters other tissues and is often referred to as internal bleeding.

  10. Burst blood vessel walls (like those that occur in an aneurysm) often lead to hemorrhage where blood pools in other organs.

  11. Capillaries • Smallest blood vessels • Composed of a single layer of cells. • Site of fluid and gas exchange between blood and body cells • Connect arterioles to venules 9small veins) to complete the circulatory system.

  12. Veins & Venules • Capillaries merge into venules which merge into veins. • Veins carry blood back to the heart

  13. Moving blood back towards your heart is difficult as blood pressure is typically lower in your veins and you have to move blood against the force of gravity. • Contractions of skeletal muscle that surrounds your veins will squeeze blood back toward your heart.

  14. Veins are also supplied with valves • Valves only open in one direction, steering blood back toward the heart and preventing it from flowing back in the opposite direction.

  15. Varicose veins • Over time, increased stretching of veins can damage the proper functioning of valves. • If valves do not function properly, blood pools and stretches veins even more causing them to bulge.

  16. Tasks • Draw a diagram to illustrate the connection between arteries, capillaries, and veins. • Text Questions Pg 318 #1-9

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