The graph shows how a student’s breathing rate changed during and after exercise. Calculate the increase in the student’s breathing rate from when he started to do exercise, to its maximum rate.

From the given graph, we can interpret that the rate of respiration of the student when he started to do the exercise was 12-13 breaths per minute. The maximum respiratory rate during exercise was 25 breaths per minute. Thus, we can say that during exercise, the respiratory rate of this student increased from 12 breaths to 25 breaths per minute.

The graph shows how a student’s breathing rate changed during and after exercise. Calculate how long it took after he finished his exercise for his breathing to return to normal.

We know that the respiratory rate increases during exercise. According to the graph, The breathing rate of the student started to increase after he did exercise, from 12 breaths per minute to 25 breaths per min. He stopped doing exercise on the eleventh minute and the breathing rate became normal on 16th minute. Thus, we can say that the breathing rate became normal after five minutes.

The graph shows how a student’s breathing rate changed during and after exercise. Explain why his breathing rate does not return to normal immediately after he stopped exercise.

Since the demand of the body for oxygen is increased and the muscles need more amount of energy to do exercise. The glucose (C 6 H 12 O 6 ) in the muscles is oxidised as fast as possible by the cells. Thus, they need more oxygen. So during exercise, to cope up with the need of the body, the muscles start oxidising glucose by anaerobic respiration. It results in the accumulation of lactic acid. At this stage, the body is under oxygen debt. It requires oxygen to return the body to normal. So as the boy stops doing exercise, the amount of oxygen required to remove the lactic acid is utilised. Thus, the respiratory rate and heart rate does not come to normal straight away.

The graph shows how a student’s breathing rate changed during and after exercise. Describe and explain how would you expect the student's heart rate to change during the 16-minute period shown on the graph.

The demand of the body for oxygen is increased during exercise because the metabolism is increased. Since the muscles need more amount of energy to do exercise. The glucose (C 6 H 12 O 6 ) in the muscles is oxidised as fast as possible by the cells to release energy. Thus, they need more oxygen. During exercise, to cope up with the need of a body, the blood circulation also increases so that supply of oxygen is not hampered. From the given graph we can see that the respiratory rate of the student is increasing from 12 breaths per minute to a maximum of 25 breaths per minute. As he breathes fast and deeply, we can say that the heart rate will also increase as he continues doing exercise. Initially, the heart rate is low which will become maximum at the 5th minute and starts decreasing after the 14th minute.

Mary Jones and Geoff Jones Solutions for Chapter: Respiration and Gas Exchange, Exercise 3: End-of-chapter questions

Author:Mary Jones & Geoff Jones

Mary Jones Biology Solutions for Exercise - Mary Jones and Geoff Jones Solutions for Chapter: Respiration and Gas Exchange, Exercise 3: End-of-chapter questions

Attempt the practice questions on Chapter 11: Respiration and Gas Exchange, Exercise 3: End-of-chapter questions with hints and solutions to strengthen your understanding. Cambridge IGCSE® Biology Coursebook Third Edition solutions are prepared by Experienced Embibe Experts.

Questions from Mary Jones and Geoff Jones Solutions for Chapter: Respiration and Gas Exchange, Exercise 3: End-of-chapter questions with Hints & Solutions

HARD

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Biology Coursebook Third Edition>Chapter 11 - Respiration and Gas Exchange>End-of-chapter questions>Q 1

Determine that the following description apply to aerobic respiration, anaerobic respiration or to both?

Lactic acid or alcohol is made.

HARD

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Biology Coursebook Third Edition>Chapter 11 - Respiration and Gas Exchange>End-of-chapter questions>Q 1

Determine that the following description apply to aerobic respiration, to anaerobic respiration or to both?

Carbon dioxide made.

HARD

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Biology Coursebook Third Edition>Chapter 11 - Respiration and Gas Exchange>End-of-chapter questions>Q 1

Determine that the following description apply to aerobic respiration, to anaerobic respiration or to both?

Heat released.

HARD

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Biology Coursebook Third Edition>Chapter 11 - Respiration and Gas Exchange>End-of-chapter questions>Q 5

A girl breathed into a machine that recorded the volume of the air that she breathed in and out. The results were recorded as a graph of volume against time. The diagrams show results obtained when she was resting and when she was exercising. Question Image

Describe the mechanism that brought these changes in the rate and depth of breathing helped the girl's body.

HARD

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Biology Coursebook Third Edition>Chapter 11 - Respiration and Gas Exchange>End-of-chapter questions>Q 6

The graph shows how a student’s breathing rate changed during and after exercise. Question Image

Calculate the increase in the student’s breathing rate from when he started to do exercise, to its maximum rate.

HARD

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Biology Coursebook Third Edition>Chapter 11 - Respiration and Gas Exchange>End-of-chapter questions>Q 6

The graph shows how a student’s breathing rate changed during and after exercise. Question Image

Calculate how long it took after he finished his exercise for his breathing to return to normal.

HARD

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Biology Coursebook Third Edition>Chapter 11 - Respiration and Gas Exchange>End-of-chapter questions>Q 6

The graph shows how a student’s breathing rate changed during and after exercise. Question Image

Explain why his breathing rate does not return to normal immediately after he stopped exercise.

HARD

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Biology Coursebook Third Edition>Chapter 11 - Respiration and Gas Exchange>End-of-chapter questions>Q 6

The graph shows how a student’s breathing rate changed during and after exercise. Question Image

Describe and explain how would you expect the student's heart rate to change during the 16-minute period shown on the graph.

Mary Jones and Geoff Jones Solutions for Chapter: Respiration and Gas Exchange, Exercise 3: End-of-chapter questions

Mary Jones Biology Solutions for Exercise - Mary Jones and Geoff Jones Solutions for Chapter: Respiration and Gas Exchange, Exercise 3: End-of-chapter questions

Questions from Mary Jones and Geoff Jones Solutions for Chapter: Respiration and Gas Exchange, Exercise 3: End-of-chapter questions with Hints & Solutions

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