8.3 Gaseous Exchange

Most of the carbon dioxide produced by the body tissue is transported to the lungs in the form of …

• Carbonic acid.

• Blood plasma.

• Bicarbonate ion.

• Carbaminohaemoglobin.

Oxyhaemoglobin gives up O₂ when …

• CO₂ concentrations are high.

• Body temperature is lowered.

• pH values are high.

• O₂ concentrations are higher.

Carbonic anhydrase in the erythrocytes …

• Catalyzes the removal of oxygen from the erythrocytes.

• Catalyzes the conversion of carbon dioxide into water.

• Catalyzes the reaction of carbon dioxide with water to form carbonic acid.

• Catalyzes the increase in blood pH.

Each haemoglobin molecule can bind reversibly with

• one atom of oxygen

• one molecule of oxygen

• two molecules of oxygen

• four molecules of oxygen

Oxygen diffuses in from

• A to B

• B to A

What is the value of the partial pressure of oxygen in the atmospheric pressure?

• 160 mm Hg

• 80 mm Hg

• 40 mm Hg

• 20 mm hg

Carbon dioxide that combine with haemoglobin is called ..

• oxyhaemoglobin

• carbonhaemoglobin

• carbaminohaemoglobin

• deoxyhaemoglobin

What is the partial pressure of carbon dioxide at sea level?

• 0.21 mm Hg

• 0.22 mm Hg

• 0.23 mm Hg

• 0.24 mm Hg

Carbon dioxide in the blood can be transported through various ways except

• bicarbonate ion

• carbonic acid

• carbaminohaemoglobin

• carbon monoxide

Blood that enters the lungs through the pulmonary vein has a low partial pressure of oxygen and a high partial pressure of carbon dioxide.

• True

• False