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KEY CONCEPT The circulatory system transports materials throughout the body.

KEY CONCEPT The circulatory system transports materials throughout the body. endothelium. smooth muscle. valve. connective tissue. ARTERY. VEIN. CAPILLARIES. arteriole. venule. Arteries, veins, and capillaries transport blood to all parts of the body.

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KEY CONCEPT The circulatory system transports materials throughout the body.

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  1. KEY CONCEPT The circulatory system transports materials throughout the body.

  2. endothelium smooth muscle valve connective tissue ARTERY VEIN CAPILLARIES arteriole venule Arteries, veins, and capillaries transport blood to all parts of the body. • Arteries carry blood away from the heart. • blood under great pressure • thicker, more muscular walls

  3. endothelium smooth muscle valve connective tissue ARTERY VEIN CAPILLARIES arteriole venule • blood under less pressure • thinner walls, larger diameter • valves prevent backflow • Veins carry blood back to the heart.

  4. endothelium smooth muscle valve connective tissue ARTERY VEIN CAPILLARIES arteriole venule • Capillaries move blood between veins, arteries, and cells.

  5. Blood pressure is a measure of the force of blood pushing against artery walls. • systolic pressure: left ventricle contracts • diastolic pressure: left ventricle relaxes • High blood pressure can precede a heart attack or stroke.

  6. Lifestyle plays a key role in circulatory diseases. • Some choices lead to an increased risk of circulatory diseases. • smoking • long-term stress • excessive weight • lack of exercise • diet low in fruitsand vegetables,high in saturatedfats

  7. Circulatory diseases affect mainly the heart and the arteries. • artery walls become thick and inflexible • plaque blocks blood flow in arteries

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