The mammalian heart and cardiac cycle Quiz
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5 questions, one answer each
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1. Which vessel carries oxygenated blood from the lungs to the heart?
- A. Aorta
- B. Pulmonary artery
- C. Vena cava
- D. Pulmonary vein
2. What causes the atrioventricular valves to close?
- A. Ventricular pressure exceeding atrial pressure
- B. Atrial pressure exceeding ventricular pressure
- C. The semilunar valves opening
- D. Relaxation of the ventricles
3. What is the length of a cardiac cycle at 60 beats per minute?
- A. 0.6 s
- B. 1.2 s
- C. 1.0 s
- D. 0.8 s
4. What stops the semilunar valves opening during atrial systole?
- A. The atria are relaxed
- B. The pressure in the ventricles is lower than in the arteries
- C. The valve tendons
- D. The septum
5. Which statement about the pulmonary artery is correct?
- A. It carries oxygenated blood to the lungs
- B. It carries oxygenated blood from the left ventricle to the body
- C. It carries deoxygenated blood from the right ventricle to the lungs
- D. It carries deoxygenated blood into the right atrium