Gaseous Exchange Across the Respiratory Surfaces

Diagram shows a section of an alveolus and a capillary in a lung. What are the concentrations of carbon dioxide at X, Y and Z?

• A

• B

• C

• D

Diagram shows an alveolus and a blood capillary. What are the partial pressure of oxygen at X, Y and Z?

• A

• B

• C

• D

Diagram shows the movement of oxygen from the alveolus into the blood capillary. What is process Q ?

• Osmosis

• Active transport

• Simple diffusion

• Facilitated diffusion

Gaseous exchange happens...

• in the bronchi
• in the lungs
• in the alveoli
• in the heart

Oxygen + haemoglobin = ?

• oxygenated haemoglobin
• oxyhaemoglobin
• haemoglobin
• oxygenglobin

Diffusion is...

• Movement of gas from an area of high concentration to high

• Movement of gas from an area of high concentration to low

• Movement of gas from an area of low concentration to high

• Movement of gas from an area of low concentration to low

Air arriving in the alveoli has a...

• Higher concentration of carbon dioxide (CO2) and a lower concentration of oxygen (O2)

• Higher concentration of oxygen (O2) and a lower concentration of carbon dioxide (CO2)

Gaseous exchange happens...

• in the bronchi
• in the lungs
• in the alveoli
• in the heart

Gaseous exchange is when...

• o2 diffuses from the alveoli to the capillary
• co2 diffuses from the alveoli to the capillary
• o2 diffuses from the capillary to the alveoli
• co2 diffuses from the capillary to the alveoli

Blood arriving in the capillary from the body has a...

• Higher concentration of carbon dioxide (CO2) and a lower concentration of oxygen (O2)
• Higher concentration of oxygen (O2) and a lower concentration of carbon dioxide (CO2)