Blood vessels and tissue fluid Quiz
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5 questions, one answer each
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1. Which feature of arteries allows them to withstand high pressure?
- A. Valves
- B. A wide lumen
- C. A thick wall containing collagen
- D. A wall one cell thick
2. How do arterioles in the muscles increase blood flow during exercise?
- A. Their smooth muscle relaxes and widens the lumen
- B. Their smooth muscle contracts and narrows the lumen
- C. Their elastic fibres recoil
- D. Their valves open
3. Why does the blood flow slowly through capillary beds?
- A. Capillaries have thick walls
- B. The total cross-sectional area is very large and the lumen is narrow
- C. The heart stops pumping
- D. Capillaries contain valves
4. What is the main cause of fluid leaving a capillary at the arteriolar end?
- A. Osmosis caused by plasma proteins
- B. Active transport by the capillary cells
- C. Contraction of the capillary wall
- D. The high hydrostatic pressure of the blood
5. A patient has a very low concentration of plasma protein. Why is she likely to develop swelling in her tissues?
- A. The blood pressure at the arteriolar end is lower
- B. Less tissue fluid returns to the capillary at the venous end
- C. More water is drawn into the capillary by osmosis
- D. Plasma proteins leave the capillary more quickly