Grade 4 Human Respiration and Circulation

Your breathing becomes slower when you start running.

• T

• F

The alveoli in the lungs exchange oxygen and carbon dioxide with the blood.

• T

• F

Arteries carry blood away from the heart.

• T

• F

The diaphragm is responsible for trapping dust and dirt from the air.

• T

• F

Respiration is usually a voluntary process that you have to think about constantly.

• T

• F

Which part of the body measures the number of heartbeats per minute?

• Lungs

• Pulse

• Diaphragm

• Voice box

What is the main function of red blood cells?

• Fight infections

• Carry oxygen

• Produce mucus

• Trap dust

Through which chamber does blood enter the heart?

• Left ventricle

• Right ventricle

• Left atrium

• Right atrium

What are the smallest blood vessels called?

• Arteries

• Veins

• Capillaries

• Alveoli

Which of these is NOT part of the upper respiratory system?

• Nose

• Sinus

• Diaphragm

• Throat