How thick is the alveolus and blood capillaries?

• One-cell-thick

• Two-cell-thick

• Three-cell-thick

• Four-cell-thick

Answer explanation

Oxygen and haemoglobin combine is?

• Oxygen

• Heamoglobin

• Oxyhaemoglobin

• Heamoglobingen

The action of oxygen going into the blood capillaries is called?

• Respiration

• Diffusion

• Diversion

• Breathing

Why is red blood cells originally not red?

• Because the body coloured it

• Because there isn't much carbon dioxide

• Because the red blood cells gets the colour from oxygen

• Because can

Name two of the adaption of the alveolar structure

• Moist wall of alveolus

• Thickness of the walls of alveolus

• Marinate the tranches of the alveolus

• The group of blood cells of alveolus