The heart and cardiac cycle Quiz
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5 questions, one answer each
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1. Which blood vessel carries oxygenated blood from the lungs to the heart?
- A. Pulmonary artery
- B. Aorta
- C. Vena cava
- D. Pulmonary vein
2. A man has a stroke volume of 80 cm³ and a heart rate of 72 beats per minute. What is his cardiac output?
- A. 152 cm³ min⁻¹
- B. 5760 cm³ min⁻¹
- C. 576 cm³ min⁻¹
- D. 1.1 cm³ min⁻¹
3. During ventricular systole, what causes the atrioventricular valves to close?
- A. Ventricular pressure rising above atrial pressure
- B. Atrial pressure rising above ventricular pressure
- C. Contraction of the valve tendons
- D. Aortic pressure falling
4. In a study, people who ate more saturated fat had more heart disease, but they also smoked more. What does this show?
- A. Saturated fat definitely causes heart disease
- B. Smoking has no effect on heart disease
- C. The study must be wrong
- D. There is a correlation, but smoking is a confounding variable so cause is not proven
5. Why is the left ventricle wall thicker than the right ventricle wall?
- A. It holds more blood
- B. It contracts more slowly
- C. It pumps blood at higher pressure around the whole body
- D. It receives blood from the vena cava