Stimuli, both internal and external, are detected and lead to a response (A-level only)

Medium
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Question 8
Medium

A clinical researcher investigated the effect of a paced deep-breathing exercise on the heart rate of a group of volunteers.

Before starting the exercise, the mean resting heart rate of the volunteers was 76 beats per minute76\text{ beats per minute}76 beats per minute.

The mean change in heart rate over 15 minutes15\text{ minutes}15 minutes of the paced deep-breathing exercise is shown in the graph below:

Line graph showing mean change in heart rate against time during deep-breathing exercise

Ten minutes after starting the deep-breathing exercise, the mean cardiac output (volume of blood leaving the heart per minute) of the volunteers was 4.8 dm3 per minute4.8\text{ dm}^3\text{ per minute}4.8 dm3 per minute.

Calculate the mean stroke volume (volume of blood leaving the heart at each beat) ten minutes after starting the exercise. Give your answer in cm3\text{cm}^3cm3.

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Stimuli, both internal and external, are detected and lead to a response (A-level only) Questions

  1. A Level
  2. /Biology
  3. /Stimuli, both internal and external, are detected and lead to a response (A-level only)