Cambridge OCR A Level · Physical Education - H555

Exercise in the heat: Practice Questions

5 multiple-choice questions marked as you go, and 5 written questions with worked solutions. All on Exercise in the heat.

10 questions30 marksFree, no account

Question 1

1 mark

During exercise in a hot environment, the body may experience cardiovascular drift. What is the primary characteristic of this physiological phenomenon during prolonged, steady-state exercise?

Question 2

1 mark

In conditions of extreme heat, a marathon runner experiences cardiovascular drift. Which statement best explains the mechanism and resulting effect on the cardiovascular system during this phenomenon?

Question 3

1 mark

During prolonged exercise in the heat, the body must balance metabolic demand with thermoregulation. Evaluate the impact of peripheral vasodilation on the cardiovascular system during this process.

Question 4

1 mark

Which of the following describes the most significant chronic adaptation to exercise in the heat that aids in maintaining a lower core temperature during performance?

Question 5

1 mark

Analyze the oxyhaemoglobin dissociation curve in the context of an athlete exercising in high heat. What is the effect of the temperature increase on oxygen delivery at the muscles?

Question 6

3 marks

Outline why cardiovascular drift is more pronounced when exercising in the heat compared to a temperate environment.

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Question 7

5 marks

During exercise at a constant high intensity, cardiovascular drift may occur. Explain the physiological mechanism behind this phenomenon and how it affects stroke volume and heart rate.

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Question 8

6 marks

Analyze how the vascular shunt mechanism and the vasomotor centre interact to facilitate temperature regulation during prolonged exercise in high ambient temperatures.

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Question 9

5 marks

Elite marathon runners often struggle with cardiovascular drift when competing in high-ambient temperatures.

(a) Define the term cardiovascular drift and describe the physiological process that leads to its occurrence during prolonged exercise in the heat.
(b) Explain how the redistribution of cardiac output to the skin for temperature regulation impacts stroke volume and heart rate to maintain cardiac output.

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Question 10

6 marks

During a triathlon held in 35°C heat, an athlete experiences a significant rise in core body temperature.

(a) Describe the role of the vasomotor centre and pre-capillary sphincters in the redistribution of cardiac output during exercise in these conditions.
(b) Explain the potential respiratory and cardiovascular risks associated with exercising in extreme heat if the body fails to maintain homeostasis through temperature regulation.

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