Respiratory System 2025

Where does Gaseous Exchange take place?

• Alveoli

• Lungs

• Bronchioles

• Trachea

During inspiration, which one of these must air first pass through before entering the lungs?

• Alveoli

• Bronchioles

• Bronchi

• Trachea

How thick are the walls of the capillaries

• Thin

• Thick

• 1 cell thick

• 2 cells thick

The blood vessels surrounding the 'air sacs' are called?

During inhalation, the diaphragm...

• relaxes and moves down

• relaxes and moves up

• contracts and moves up

• contracts and moves down

What key word describes the process of Gaseous Exchange?

• Permiation

• Extraction

• Diffusion

• Displacement

What is the percentage of oxygen in exhaled air?

• 20%

• 16%

• 21%

• 12%

What is the percentage of Carbon Dioxide in inhaled air?

• 0.04%

• 4%

• 1%

• 0.004%

Which muscles are actively involved in expiration during exercise?

• External intercostals

• Internal intercostals

• Abdominals

• Diaphragm

What must exist for Gaseous Exchange to occur?