Respiratory System Quiz

Why is the left lung smaller than the right lung?

• To allow extra space for the heart

• Because it develops later in human growth

• Due to genetic variation

• To improve breathing efficiency

The process of gas exchange between air and blood cells occurs in:

• The bronchi

• The trachea

• The alveoli

• The pharynx

What biological mechanism causes yawning?

• A way to stretch muscles

• A signal from the brain to increase oxygen intake when tired

• A random involuntary action

• A digestive system response

Which structure prevents food from entering the lungs during swallowing?

• Bronchioles

• Cilia

• Epiglottis

• Diaphragm

How do cilia function in the respiratory system?

• They produce oxygen

• They filter and remove unwanted substances

• They generate heat

• They create mucus

Approximately how many breaths does a person take in a day?

• 5,000

• 10,000

• 20,000

• 50,000

What happens to the diaphragm when you inhale?

• It relaxes completely

• It tightens and flattens

• It contracts downward

• It remains unchanged

The exchange of oxygen and carbon dioxide is called:

• Diffusion

• Respiration

• Circulation

• Filtration

Which body system works closely with the respiratory system?

• Digestive system

• Skeletal system

• Circulatory system

• Muscular system

How thick are bronchioles compared to human hair?

• Exactly the same thickness

• Twice as thick

• Half as thick

• About the same thickness as a single hair