Exercise

Question 1

How do you calculate a percentage change?

Answer 1

New value - old value / old value

Question 2

What is the effect of exercise on breathing rate?

Answer 2

Exercise increases breathing rate and depth to deliver more oxygen to working muscles and remove carbon dioxide.

Question 3

Why does breathing rate change with and after exercise?

Answer 3

Breathing rate changes during and after exercise because the body needs more oxygen to fuel active muscles and remove carbon dioxide, a waste product of respiration. After exercise, the breathing rate remains elevated to repay an “oxygen debt” and remove lactic acid, which builds up during intense activity

Question 4

Describe an experiment that investigates the effect of exercise on breathing rate.

Answer 4

1. Make sure your subject person is relaxed and that a normal breathing rate.
2. Start the timer at the same time start recording and writing down the amount of breaths they’re taking.
3. After a minute, stop the timer and stop recording their breaths.
4. Write down and log your data into your table.
5. Then with a stopwatch or timer starts again and simultaneously begin a late joke.
6. Stop the timer and jogging at the same time after a minute.
7. Record the breaths per minute and log to the table.
8. Repeat this process with a fast sprint making sure to return to the normal.
9. Log your data for the first person and repeat three times for each subject person.

Question 5

Anaerobic respiration

Answer 5

Glucose → Lactic acid + Energy

Question 6

Aerobic respiration

Answer 6

glucose + oxygen → carbon dioxide + water + energy

Question 7

Composition of inhaled air

Answer 7

21% oxygen, 78% nitrogen, 0.04% carbon dioxide

Question 8

Composition of exhaled air

Answer 8

16% oxygen, 4% carbon dioxide, and 78% nitrogen