7.2 Heart & Circulation

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Last updated 7:13 PM on 4/28/26
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9 Terms

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Arteries

carry blood away from the heart

  • red and oxygenated

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Veins

carry blood to the heart

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Veins'/Arteries vs Capillaries

Large Vs Small (for gas exchange)

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How many chambers does the heart have?

4

  • 2 upper = Atria

  • 2 Lower = Ventricle

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Valves

Prevent the backward flow of blood (responds to pressure)

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Two Types of valves

Atrioventricular and Semilunar

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Atrioventricular (AV) Valves

between Atria and ventricles

  • right = tricuspid valve (3 cusps)

  • left = bicuspid/mitral valves (2 cusps)

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Semilunar Valves

near origin of aorta & pulmonary trunk

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Flow of blood through heart

  1. blood flows from superior vena cava, inferior VC, and coronary sinus to Right Atrium (deoxygenated)

  2. Blood flows from right atrium → tricuspid valve → right ventricle (deoxygenated)

  3. Blood is pumped from right ventricle through pulmonary valve to pulmonary arteries (deoxygenated)

  4. In lungs, capillaries will exchange CO2 for O2. BLUE TO RED

  5. O2 blood flows through pulmonary vein → left atrium

  6. blood flow from left atrium → bicuspid (mitral) valve to left ventricle

  7. Blood pumps from left ventricle → aortic valve→aortic arch

  8. O2 rich blood flows to rest of body

  9. Gas exchange takes place in systemic capillaries, loosing O2 and gaining CO2

  10. Deoxygenated blood flows back to heart to SVC, IVC, and coronary sinus.