哺乳動物心跳速率的調節：练习题

Which of the following correctly describes the role of noradrenaline in the control of heart rate?

A sudden increase in blood pressure is detected by baroreceptors in the aortic arch. Which of the following describes the resulting homeostatic reflex to return heart rate to normal?

Which neurotransmitter is released by the sympathetic nervous system at the sinoatrial node (SAN) to increase heart rate during exercise?

During vigorous exercise, how does the cardiac centre in the medulla oblongata respond to a decrease in blood pH?

When baroreceptors in the carotid sinus detect an increase in blood pressure, which of the following autonomic responses occurs to return the pressure to normal?

Describe how the autonomic nervous system coordinates the reduction of heart rate via the sinoatrial node (SAN) following a period of intense exercise.

Analyze the physiological sequence initiated by carotid chemoreceptors when they detect a decrease in blood pH due to elevated \(CO_{2}\) levels.

When blood pressure increases, baroreceptors in the carotid sinus are stimulated. Describe the subsequent pathway through the cardiac centre that leads to a reduction in heart rate, including the specific neurotransmitter involved.

The control of heart rate is a complex process involving the autonomic nervous system and chemical signaling.
(a) Describe the role of the cardiovascular center in the medulla oblongata in responding to a decrease in blood pH.
(b) Compare the effects of the sympathetic and parasympathetic nervous systems on the sinoatrial node (SAN), including the specific neurotransmitters involved.