Pearson Edexcel A Level · Biology B (9BI0)

Control of heart rate in mammals: Practice Questions

5 multiple-choice questions marked as you go, and 4 written questions with worked solutions. All on Control of heart rate in mammals.

9 questions25 marksFree, no account

Question 1

1 mark

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

Question 2

1 mark

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?

Question 3

1 mark

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

Question 4

1 mark

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

Question 5

1 mark

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?

Question 6

4 marks

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

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Question 7

5 marks

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

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Question 8

6 marks

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.

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Question 9

5 marks

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.

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