Biology Quiz 30s
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Name the three components of the circulatory system.
How does pulmonary circulation differ from systemic circulation?
- Pulmonary circulation carries blood between the heart and lungs.
- Systemic circulation carries blood between the heart and the rest of the body.
What type of blood does the pulmonary artery carry? Pulmonary vein?
- Pulmonary artery carries deoxy-Hb
- Pulmonary vein carries oxy-Hb
What is the function of lymphatic circulation?
Carries lymph (ECF) throughout the body.
What is the path of blood flow from the cells of the body back to the heart?
cells > capillaries > venules > veins > vena cava > heart
Explain why the structure of arteries and veins differ from one another.
- Arteries have thicker muscle and elastic tissue because the arteries need to keep the blood under high pressure to ensure the blood circulates throughout the body.
- Veins have a larger lumen and thinner muscle and elastic tissue to ensure that blood circulates throughout the body.
Name the 3 different layers that compose the blood vessels.
- Intima (inner layer)
- Media (middle layer)
- Adventitia (outer layer)
What unique structural component do arterioles contain, and what is its' purpose?
Arterioles contain precapillary sphincters that regulate vasodilation and vasoconstriction.
Define the difference between vasodilation and vasoconstriction.
- Vasodilation is where precapillary sphincters relax and allows more blood to enter the capillary bed.
- Vasoconstriction is where precapillary sphincters constrict and blood flow slows down.
Explain the purpose of venous valves.
Venous valves help the blood return to the heart by the presence of one way valves.
How do varicose veins occur and what causes them?
Varicose veins occur when venous valves become weakened, stretched or damaged and the veins become permanently swollen. Causes are pregnancy, weight, or leg injury.
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