Mass transport and the mammalian heart Quiz
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5 questions, one answer each
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1. In which phase of the cardiac cycle do the semilunar valves open?
- A. Atrial systole
- B. Cardiac diastole
- C. Ventricular systole
- D. None of them; they are always open
2. Which structure carries deoxygenated blood from the heart to the lungs?
- A. Aorta
- B. Pulmonary artery
- C. Pulmonary vein
- D. Vena cava
3. A cardiac cycle lasts 0.75 s. What is the heart rate?
- A. 75 beats per minute
- B. 60 beats per minute
- C. 80 beats per minute
- D. 90 beats per minute
4. Why is the right ventricle wall thinner than the left?
- A. It pumps blood only to the nearby lungs at lower pressure
- B. It contains less blood overall
- C. It is not made of muscle
- D. It has no valves
5. Why do large, active animals need a heart?
- A. Gases cannot diffuse at all
- B. Their surface area to volume ratio is large
- C. Their small surface area to volume ratio and high metabolic rate make diffusion too slow
- D. They have no need to transport waste