MCQ Detailed View

The pH of blood is a measure of how acidic or basic it is. Human blood is slightly basic, and its normal pH range is 7.35 to 7.45. Maintaining this range is very important because even small changes can affect how the body works.

Red blood cells (RBCs) play a key role in carrying oxygen from the lungs to the body and carbon dioxide back to the lungs. The pH of blood helps keep these processes stable. Blood has a buffer system, mainly the bicarbonate buffer, which prevents big changes in pH when acids or bases enter the bloodstream.

If blood becomes too acidic (pH below 7.35), it is called acidosis, which can slow down body functions and be dangerous. If blood becomes too basic (pH above 7.45), it is called alkalosis, which can also harm the body. The body maintains pH through breathing, kidney function, and chemical buffers in the blood.

Understanding blood pH is a fundamental concept in Biology, especially in human physiology and health science. It explains why the body tightly regulates chemicals in the blood, allowing cells to work properly.

So the correct answer is 7.35-7.45, as this is the normal pH range of human blood and red blood cells.