CHAPTER 8.3 & 8.4 (FORM 4)

What is the primary function of the alveoli in the human respiratory system?

• Transporting oxygen in the blood

• Exchanging gases between air and blood

• Filtering dust and particles from the air

• Producing sound for speech

Which part of the respiratory system is directly involved in the process of gaseous exchange?

• Trachea

• Bronchi

• Alveoli

• Larynx

What does gas diffusion depend on?

• Temperature difference

• Partial pressure difference

• Volume difference

• Density difference

In which direction does gas diffuse according to its partial pressure?

• From lower to higher partial pressure

• From higher to lower partial pressure

• From higher to higher partial pressure

• From lower to lower partial pressure

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

• To filter blood

• To exchange gases

• To pump blood

• To produce hormones

Which gas diffuses into the red blood cells from the alveoli?

• Carbon dioxide

• Nitrogen

• Oxygen

• Helium

What happens to carbon dioxide during gas exchange in the alveoli?

• It is diffuses into the alveoli

• It is converted into oxygen

• It is stored in the alveoli

• It is diffused into the blood

What happens to carbon dioxide after it diffuses into the alveolus?

• It is absorbed into the bloodstream

• It is expelled into the atmosphere

• It is converted into oxygen

• It is stored in the lungs

What is the partial pressure of oxygen in the alveolus compared to the lung capillaries?

• Lower

• Higher

• The same

• Variable

What happens to oxygen after it diffuses into the lung capillaries?

• It binds with carbon dioxide

• It diffuses into the erythrocyte and binds with haemoglobin

• It fully dissolves in the blood plasma