🫁 Respiratory System Quiz

Where does air enter the respiratory system first?

• Mouth/Nose
• Trachea
• Bronchi
• Alveoli

Answer explanation

Air enters through the mouth or nose.

Which structure connects the throat to the lungs?

• Bronchi
• Trachea
• Alveoli
• Diaphragm

Answer explanation

The trachea is the windpipe that connects throat to lungs.

What are the small air sacs in the lungs called?

• Bronchi
• Bronchioles
• Alveoli
• Capillaries

Answer explanation

Alveoli are the site of gas exchange.

Which structure branches into smaller bronchioles?

• Trachea
• Bronchi
• Diaphragm
• Alveoli

Answer explanation

The bronchi branch into bronchioles.

Which muscle is the primary muscle responsible for breathing?

• Heart
• Intercostals
• Diaphragm
• Abdominals

Answer explanation

The diaphragm contracts and relaxes during breathing.

During inspiration at rest, what happens to the diaphragm?

• Contracts & flattens
• Relaxes & domes up
• Contracts & domes up
• Relaxes & flattens

Answer explanation

The diaphragm contracts and flattens to allow air in.

During expiration at rest, what happens to pressure inside the lungs?

• Decreases
• Increases
• Stays same
• Becomes negative

Answer explanation

Pressure increases so air is pushed out.

Which muscles assist breathing during exercise?

• Only diaphragm
• Sternocleidomastoid & abdominals
• Biceps & triceps
• Quadriceps & hamstrings

Answer explanation

Extra muscles help force breathing during exercise.

What happens to chest cavity volume during inspiration?

• Increases
• Decreases
• Stays the same
• Contracts

Answer explanation

The chest cavity increases in volume.

What happens to air pressure inside the lungs during inspiration?

• Increases
• Decreases
• Stays the same
• Becomes positive

Answer explanation

Air pressure decreases so air flows in.