For how long can a person survive without breathing?

• 2 minutes

• 10 minutes

• 30 minutes

• 10 hours

What is the main function of the alveoli?

• Gas exchange

• Air filtration

• Air humidification

• Air movement

What is the percentage of oxygen in the atmosphere?

• 10%

• 21%

• 50%

• 100%

Which part of the respiratory system is responsible for voice production?

• Larynx

• Trachea

• Bronchi

• Alveoli

What happens to the diaphragm during inhalation?

• Contracts

• Relaxes

• No change

• Moves up

What is the main function of CO2 in the respiratory system?

• Removal of waste gas only

• Removal of waste gas and regulation of blood pH

• Oxygen transport

• Air filtration

Which blood vessel carries oxygenated blood from the lungs to the heart?

• Pulmonary vein

• Pulmonary artery

• Aorta

• Vena cava

What is the first thing that happens when a person inhales?

• Open question

• Diaphragm contracts

• Air enters the lungs

• Oxygen is absorbed

Which gas is primarily exchanged in the alveoli?

• Oxygen

• Nitrogen

• Carbon dioxide

• Hydrogen

What is the role of the nasal cavity in the respiratory system?

• Oxygen transport

• Voice production

• Air filtration and humidification

• Gas exchange