Directions: Read each item carefully. Encircle the letter of the
best answer.


1. When you inhale, which of the following contracts and moves down?

A. bronchioles B. diaphragm C. lungs D. nose

2. When you exhale, which way does the rib cage move?

A. It moves up. C. It moves down.

B. It moves out. D. It stays the same.

3. How does the body use the energy released in its cells?

A. to rest the body C. for muscles to move

B. for making oxygen D. to lower body temperature

4. What happens when you breathe in air?

A. The diaphragm expands and the ribcage contracts.

B. The diaphragm contracts and the ribcage expands.

C. The diaphragm expands and the ribcage collapses

D. The diaphragm contracts and the ribcage remains the same.

7

THE CIRCULATORY SYSTEM

ACTIVITY:

Interpreting data

Study the table below. Answer the questions that follow.

Types of Exercise Breaths taken per Minute

1.Resting 25

2.Walking slowly 34

3.Walking quickly 45

4.Running 60

Questions:

1. Does exercise affect the rate of your breathing? How?

2. What could be the reason for this change?

3. Why do you think your heart beat fast after running?

4. Aside from exercising, what else can you do to make your respiratory system work well?​