Circulatory system 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. Aorta
- B. Vena cava
- C. Pulmonary vein
- D. Pulmonary artery
2. Which part of the blood carries oxygen?
- A. Plasma
- B. Red blood cells
- C. White blood cells
- D. Platelets
3. Which statement describes a vein?
- A. It has valves and carries blood to the heart
- B. It has thick walls and carries blood away from the heart
- C. It has walls one cell thick
- D. It supplies the heart muscle with blood
4. What causes a heart attack?
- A. Too little exercise only
- B. The aorta bursting
- C. Part of the heart muscle being starved of oxygen when a coronary artery is blocked
- D. Valves opening too wide
5. What happens to pulse rate during exercise, and why?
- A. It falls because muscles need less oxygen
- B. It rises because muscles need more oxygen and glucose
- C. It stays the same
- D. It rises because the blood is cooler