Part 1: Energy Systems and Exercise Response

Choose the best answer for Questions 1–4.

1. What is the main purpose of ATP in the body during exercise?

To store oxygen in the lungs

To provide energy for muscle contraction

To cool the body

To digest food

2. Which energy system is used most during a very short, explosive activity such as a 5-second sprint?

Aerobic system

ATP-PC system

Anaerobic glycolysis system

Digestive system

3. Which energy system relies most on oxygen and can provide energy for a long time?

ATP-PC system

Aerobic system

Anaerobic glycolysis system

Nervous system

4. Which is a normal response to exercise?

Heart rate decreases

Breathing becomes slower and deeper only at rest

Body temperature may increase

Muscles need less blood

5. Select all the normal responses to exercise.

Increased heart rate

Increased breathing rate

Sweating

Reduced blood flow to working muscles

Part 2: Short Answers and Nutrition

Answer in complete sentences where appropriate.

6. Explain why heart rate and breathing rate increase during exercise.

7. What is the difference between anaerobic and aerobic energy production?

8. Match each nutrient to its main role. Write the correct letter beside each nutrient.

Carbohydrates: ______

Protein: ______

Fats: ______

Water: ______

A. Helps regulate temperature and replace fluid

B. Main quick energy source for exercise

C. Supports muscle repair and growth

D. Provides stored energy and supports body functions

9. Suggest one suitable food or drink choice before exercise and explain why it may be helpful.

10. A student finishes a 30-minute training session feeling hot and thirsty. State two appropriate recovery actions and explain one of them.

Teacher Answer Sheet

1. To provide energy for muscle contraction.

2. ATP-PC system.

3. Aerobic system.

4. Body temperature may increase.

5. Increased heart rate, increased breathing rate, and sweating.

6. Heart rate increases to pump more blood and oxygen to working muscles and remove waste products. Breathing rate increases to take in more oxygen and remove more carbon dioxide.

7. Anaerobic energy production does not require oxygen and is used mainly for short, high-intensity activities. Aerobic energy production uses oxygen and is important for longer-duration activities.

8. Carbohydrates – B; Protein – C; Fats – D; Water – A.

9. Accept suitable examples such as a banana, toast, cereal, or yoghurt. Answers should mention providing energy, especially from carbohydrates.

10. Accept actions such as drinking water, cooling down, replacing fluids, eating a recovery snack containing carbohydrates and protein, and changing out of wet clothing. Explanations should link the action to rehydration, cooling, energy replacement, or muscle repair.