Gaseous Exchange and the Respiratory System Quiz

What is the primary function of the bronchi in the respiratory system?

• To produce mucus

• To exchange gases with the blood

• To filter dust and particles from the air

• To transport air to the bronchioles

Which structure in the respiratory system is directly involved in the exchange of gases?

• Trachea

• Bronchi

• Alveoli

• Diaphragm

How does oxygen enter the bloodstream from the alveoli?

• Through active transport

• By diffusion across the alveolar wall

• Via osmosis

• Through capillary action

What role do the intercostal muscles play during inhalation?

• They produce mucus to trap dust

• They relax to decrease chest volume

• They contract to increase chest volume

• They help in the exchange of gases

What happens to the diaphragm when you exhale?

• It remains stationary

• It relaxes and moves up

• It contracts and moves up

• It contracts and moves down

What is the approximate percentage of oxygen in the air we inhale?

• 79%

• 21%

• 16%

• 4%

Why does the percentage of carbon dioxide increase in exhaled air?

• Because it is absorbed from the environment

• Due to cellular respiration producing carbon dioxide

• Because nitrogen is converted to carbon dioxide

• Due to the breakdown of oxygen in the lungs

Which gas remains unchanged in percentage during inhalation and exhalation?

• Helium

• Nitrogen

• Carbon dioxide

• Oxygen

Where does cellular respiration primarily occur within the cell?

• Nucleus

• Cytoplasm

• Mitochondria

• Ribosome

What is the main waste product of cellular respiration?

• Water

• Carbon dioxide

• Oxygen

• Nitrogen