Question

Read the passage and answer the following question.

Both myoglobin and hemoglobin are oxygen-binding molecules found in vertebrates. Myoglobin is the major oxygen-binding protein of muscle, whereas hemoglobin is the major oxygen-binding protein of blood. The following graphs called oxygen dissociation curves. On the x-axis is the pressure of oxygen $\left(O_2\right)$ and on the y-axis is the proportion of oxygen binding sites that are filled, referred to as saturation.

Hemoglobin in capillaries of the lungs is exposed to an oxygen pressure of 100. This hemoglobin is transported within red blood cells to capillaries in muscle, where the oxygen pressure is only 20. The condition occurs in the muscle is

• A. The hemoglobin will bind the oxygen from the muscle.
• B. The hemoglobin will enter the muscle cells.
• C. The hemoglobin will release most of the oxygen it is carrying.
• D. The hemoglobin will release less than half of the oxygen it is carrying.
• E. The hemoglobin will not release any oxygen.

Answer 1

The correct option is C The hemoglobin will release most of the oxygen it is carrying.

According to Darcy’s law, if there is a pressure gradient, the flow of pressure is from high pressure to low pressure. So, when haemoglobin having an oxygen pressure of 100 goes to capillaries of muscles having an oxygen pressure of 20, oxygen will move from the haemoglobin to the muscle capillaries, that is, the haemoglobin will release most of its oxygen that it is carrying.

So, the correct answer is 'The haemoglobin will release most of the oxygen it is carrying'.