Circulation in humans Quiz
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5 questions, one answer each
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1. Which of the following correctly describes the route of blood through the double circulatory system?
- A. Heart → lungs → heart → body → heart
- B. Heart → body → heart → lungs → body
- C. Lungs → heart → body → heart → lungs
- D. Body → heart → lungs → body → heart
2. Red blood cells are adapted for oxygen transport. Which adaptation is NOT a feature of mammalian red blood cells?
- A. They lack a nucleus to provide more space for haemoglobin
- B. They have a biconcave shape to increase surface area
- C. They contain haemoglobin to bind oxygen molecules
- D. They have a cell membrane to prevent oxygen loss
3. Capillaries are the site of exchange between blood and body cells. Which structural feature of capillaries makes them particularly suitable for this function?
- A. Thick muscle layer and elastic fibres to withstand high pressure
- B. Single layer of endothelial cells and small diameter to allow slow blood flow
- C. Multiple layers of smooth muscle to regulate blood flow
- D. Valves to prevent backflow of blood
4. During the cardiac cycle, the atrioventricular valves close when the ventricles contract. Why is this closure functionally important?
- A. To prevent blood from flowing backwards into the atria
- B. To increase the pressure in the atria for the next contraction
- C. To slow down the heart rate and prevent cardiac overload
- D. To allow the semilunar valves to open simultaneously
5. A person is diagnosed with coronary heart disease caused by narrowed coronary arteries. Which combination of treatments would address both the immediate blockage and reduce future risk factors?
- A. Heart transplant alone, as it is the only permanent cure
- B. Stent insertion combined with statins and lifestyle changes
- C. Bypass surgery with increased salt intake and smoking
- D. Aspirin therapy with high saturated fat diet to stabilise plaques