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.

In the chloride shift, ________________ move into the erythrocyte to replace the ______________ that move out.

• Chloride ions; carbon dioxide molecules.

• Carbon dioxide molecules; chloride ions.

• Bicarbonate ions; chloride ions.

• Chloride ions; bicarbonate ions.

Oxyhaemoglobin gives up O₂ when …

• CO₂ concentrations are high.

• Body temperature is lowered.

• pH values are high.

• O₂ concentrations are higher.

Tags

NGSS.HS-LS1-3

The Bohr shift occurs in region of …

• Increased partial pressure of oxygen.

• Decreased partial pressure of oxygen.

• Increased partial pressure of carbon dioxide.

• Decreased partial pressure of carbon dioxide.

The acidity due to the accumulation of H⁺ in erythrocytes is buffered by …

• Haemoglobin.

• Plasma proteins.

• Carbon dioxide.

• Oxygen.

When chemoreceptors detect a slight decrease in pH, this means that _______________ concentrations have increased, and the breathing rate must ________________ .

• Carbon dioxide; increase.

• Carbon dioxide; decrease.

• Oxygen; increase.

• Oxygen; decrease.

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.

Which of the following are the chemoreceptors that responsible in control breathing?

• Aortic bodies

• Aorta bodies

• Carotid bodies

• Carotic bodies

Each haemoglobin molecule can bind reversibly with

• one atom of oxygen

• one molecule of oxygen

• two molecules of oxygen

• four molecules of oxygen

Which of the following explains why myoglobin is found in large amounts in the flight muscles of birds?

• Myoglobin can supply the energy needed while flying.

• Myoglobin can supply oxygen to the muscular tissues when the birds are flying in areas with low oxygen partial pressures.

• Compared to haemoglobin, myoglobin has a higher affinity for oxygen and can retain oxygen better in active muscles.

• Myoglobin has a smaller molecular size than haemoglobin.