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Questions and Answers
What is the role of the sinoatrial node (SAN) in the heart?
What is the role of the sinoatrial node (SAN) in the heart?
- Regulates the opening and closing of heart valves
- Transports deoxygenated blood to the lungs
- Pumps oxygenated blood to the rest of the body
- Initiates the heartbeat by generating electrical impulses (correct)
Which blood vessel has thick muscle and high pressure?
Which blood vessel has thick muscle and high pressure?
- Capillaries
- Pulmonary vein
- Arteries (correct)
- Veins
What is the significance of PQRST points on an ECG trace?
What is the significance of PQRST points on an ECG trace?
- They indicate blood pressure changes in the arteries
- They represent different phases of the cardiac cycle (correct)
- They measure the thickness of the heart's septum
- They show the concentration of oxygen in the blood
Which factor can increase the risk of cardiovascular disease (CVD) based on genetics?
Which factor can increase the risk of cardiovascular disease (CVD) based on genetics?
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What is the effect of caffeine on heart rate in Daphnia?
What is the effect of caffeine on heart rate in Daphnia?
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