Transport of Oxygen

Q.

Carbon monoxide gas has 200 times more affinity for hemoglobin than oxygen.

1. True
2. False

Q. It is known that exposure to carbon monoxide is harmful to animals because:

1. It reduces $C{O}_2$ transport
2. It reduces $O_2$ transport
3. It increases $C{O}_2$ transport
4. It increases $O_2$ transport

Q. Oxygen is transported by blood in which of the following forms?

1. Dissolved in blood plasma
2. Bound to haemoglobin
3. As bicarbonate ions
4. As oxygen ions

Q.

How many molecules of oxygen can associate with a molecule of haemoglobin?

1. One

2. Two

3. Four

4. Three

Q.

What is the function of white blood cells?

1. They have defensive function against infection.

2. They mediate transport of oxygen from lungs to tissues.

3. They help in the clotting of blood.

4. They act as a source of energy.

Q. If haemoglobin is 75% saturated, then how many oxygen molecules are combined with haemoglobin?

1. 3
2. 2
3. 3/2
4. 1

Q. The rate of $C{O}_2$ diffusion is much higher compared to $O_2$. What could be the possible reason for the same?

1. Solubility of $O_2$ is higher than $C{O}_2$
2. Solubility of $C{O}_2$ is higher than $O_2$
3. $O_2$ is insoluble
4. It does not depend upon the solubility of the gases

Q. Haemoglobin has a higher affinity for oxygen than for carbon monoxide.

1. False
2. True

Q. What is/ are the factor/ factors that affect the transportation of oxygen within the body?

1. Partial pressure of oxygen and carbon dioxide
2. Temperature
3. Hydrogen ion concentration
4. All the above

Q. Which two of the following changes (I-IV) usually tend to occur in the plain dwellers, when they move to high altitudes (3500 m or more)?
I. Increase in red blood cell size.
II. Increase in red blood cell production.
III. Increased breathing rate.
IV. Increase in thrombocyte count.
Changes occurring are

1. II and III
2. III and IV
3. I and IV
4. I and II

Q. If four molecules of oxygen bind to haemoglobin then the compound oxyhaemoglobin formed can be represented as

1. $Hb{O}_2$
2. $Hb{O}_6$
3. $Hb{O}_4$
4. $Hb{O}_8$

Q. If haemoglobin is 75% saturated, then how many oxygen molecules are combined with haemoglobin?

1. 3
2. 2
3. 3/2
4. 1

Q.

Exposure to carbon monoxide (e.g., coal gas) is extremely dangerous and can kill a person because -

1. Carboxyhaemoglobin reduces the ability of blood to transport oxygen by rupturing a vast majority of erythrocytes.

2. The compound carboxyhemoglobin is formed with haemoglobin, which gradually clots the blood resulting in circulatory failure.

3. Carboxyhaemoglobin greatly modifies the structure of haemoglobin, thus making it lose its affinity for oxygen.

4. Carboxyhaemoglobin is formed which decreses binding affinity of oxygen

Q. Which of the following statements regarding gases transportation is not correct?

1. Oxygen irreversibly binds to haemoglobin
2. Carbon dioxide reversibly binds to haemoglobin
3. Oxygen is transported by RBC and plasma .
4. All are correct.

Q. Oxygen bound to haemoglobin as well as dissolved oxygen contribute to $p{O}_2$ of blood.

1. True
2. False

Q. Identify the correct statement with reference to transport of respiratory gases by blood.

1. Haemoglobin is necessary for transport of carbon dioxide and carbonic anhydrase for transport of oxygen
2. Haemoglobin is necessary for transport of oxygen and carbonic anhydrase for transport of carbon dioxide
3. Only oxygen is transported by blood
4. Only carbon dioxide is transported by blood

Q. Partial pressure of oxygen in the alveoli of the lungs is

1. less than that in the blood
2. less than that of carbon dioxide
3. equal to that in the blood
4. more than that in the blood

Q. Which of the following gives blood its reddish colour?

1. Deoxygenated haemoglobin
2. Haemoglobin in any form
3. Oxygenated haemoglobin
4. The subunits of haemoglobin

Q. The haemoglobin of a human foetus

1. has only 2 protein subunits instead of 4
2. has a higher affinity for oxygen than that of an adult
3. has a lower affinity for oxygen than that of the adult
4. its affinity for oxygen is the same as that of an adult

Q.

When there is low tension of oxygen, oxyhaemoglobin rapidly______

1. fades

2. dissociates

3. multiplies

4. balances

Q. Oxygen is transported by blood in which of the following forms?

1. Dissolved in blood plasma
2. Bound to haemoglobin
3. As bicarbonate ions
4. As oxygen ions