Oxygen Dissociation Curve

Q.

$P_{5}0$ is the partial pressure of oxygen at which haemoglobin is 50% saturated. What will happen to the$P_{5}0$ value if there is an increase in the partial pressure of Carbon dioxide and what effect will it have on the oxygen affinity of haemoglobin (Hb)?

1. $P_{5}0$ value will decrease and the oxygen affinity of Hb will decrease

2. $P_{5}0$value will increase and the oxygen affinity of Hb will increase

3. $P_{5}0$ value will decrease and the oxygen affinity of Hb will increase

4. $P_{5}0$ value will increase and the oxygen affinity of Hb will decrease

Q. When temperature decreases the oxyhaemoglobin curve will become

1. More steep
2. Straight
3. Parabola
4. All of the above

Q. Oxygen dissociation curve is

1. Sigmoid
2. Parabolic
3. Hyperbolic
4. Straight line

Q. Decrease in pH causes the oxygen dissociation curve of haemoglobin to shift to

1. left
2. right
3. remain unchanged
4. oscillate erratically

Q. When temperature decreases the oxyhaemoglobin curve will become

1. More steep
2. Straight
3. Parabola
4. All of the above

Q. Dissociation of oxyhaemoglobin in blood increases when there is

1. increase in pH and decrease in ${\mathrm{CO}}_2$ concentration
2. decrease in temperature and increase in $O_2$ concentration
3. increase in $O_2$ concentration and decrease in ${\mathrm{CO}}_2$ concentration
4. decrease in pH and increase in ${\mathrm{CO}}_2$ concentration

Q.

Oxygen associates with haemoglobin under which of the following conditions?

1. Low partial pressure of oxygen

2. A high partial pressure of carbon dioxide

3. Low H⁺ ion concentration

4. High temperature

Q. The relationship curve between blood ${\mathrm{pO}}_2$ and % Hb saturation is.

1. linear
2. Z shaped
3. S shaped
4. J shaped

Q. Oxygen dissociation curve is

1. Sigmoid
2. Parabolic
3. Hyperbolic
4. Straight line

Q.

Oxygen associates with haemoglobin under which of the following conditions?

1. Low partial pressure of oxygen

2. A high partial pressure of carbon dioxide

3. Low H⁺ ion concentration

4. High temperature

Q.

The oxygen dissociation curve shifts to the right when

1. partial pressure of $C{O}_2$ decreases

2. partial pressure of $C{O}_2$ increases

3. partial pressure of $O_2$ decreases

4. pH of blood increases

Q. In the given figure curve shows percentage saturation of haemoglobin with $O_2$ is plottedagainst $p{O}_2$. This curve is highly useful instudying the effect of which factors on binding of $O_2$ with haemoglobin?

1. Carbonic anhydrase
2. $pC{O}_2$
3. $H^{+}$concentration
4. Both b and c

Q.

The oxygen-haemoglobin dissociation curve will show a right shift in case of

1. High partial pressure of carbon dioxide

2. Decrease in temperature

3. Decrease in pH

4. All of these