Choose all the functions of the sinoatrial node.Question 3Select one or more:a.to regulate atrial systole.b.The impulse wave travels throughout the muscle of the atria, causing the cells to contract.c.to act as the heart's pacemaker.d.The sinoatrial node generates an electrical pulses at intervals.
Question
Choose all the functions of the sinoatrial node.Question 3Select one or more:a.to regulate atrial systole.b.The impulse wave travels throughout the muscle of the atria, causing the cells to contract.c.to act as the heart's pacemaker.d.The sinoatrial node generates an electrical pulses at intervals.
Solution
The correct answers are:
a. to regulate atrial systole. c. to act as the heart's pacemaker. d. The sinoatrial node generates an electrical pulses at intervals.
The sinoatrial node, also known as the SA node, is the natural pacemaker of the heart. It initiates the electrical impulses that regulate the heart's rhythm. These impulses cause the atria to contract, or undergo systole, pushing blood into the ventricles. This is why option a is correct.
Option c is also correct because the SA node's role as the heart's pacemaker is well established in medical literature.
Option d is correct because the SA node does generate electrical pulses at regular intervals, which are responsible for each heartbeat.
Option b is not entirely correct. While it's true that the impulse wave from the SA node does cause the atrial cells to contract, this is not a function of the SA node itself, but rather a result of its impulses. The SA node's function is to generate these impulses, not to cause contraction.
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