The heart and mammalian circulation Quiz
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5 questions, one answer each
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1. Which statement describes a double circulation?
- A. Blood passes through the heart twice per circuit
- B. Blood passes through the heart once per circuit
- C. The heart has only one ventricle
- D. Blood flows through gills before the heart
2. Which node delays the wave of excitation before it reaches the ventricles?
- A. Sinoatrial node
- B. Purkyne fibre
- C. Atrioventricular node
- D. Coronary node
3. What causes the semilunar valve in the aorta to open?
- A. Atrial pressure exceeds ventricular pressure
- B. Ventricular pressure exceeds aortic pressure
- C. Aortic pressure exceeds ventricular pressure
- D. Nervous impulses from the brain
4. An ECG shows R waves 0.6 s apart. What is the heart rate?
- A. 60 beats per minute
- B. 80 beats per minute
- C. 100 beats per minute
- D. 120 beats per minute
5. Which feature of the aorta wall helps to maintain blood pressure between beats?
- A. Pocket valves
- B. A wide lumen
- C. A wall one cell thick
- D. Elastic fibres that recoil