The number of RBCs at high altitude will:
Correct answer: B. Increase in number
- A. Increase in size
- B. Increase in number
- C. Decrease in size
- D. Decrease in number
Explanation
The number of red blood cells (RBCs) at high altitude will increase. This is because at high altitudes, the concentration of oxygen in the air is lower, which means that less oxygen is available to be transported to the body's tissues. To compensate for this, the body produces more RBCs, which contain hemoglobin (the protein that carries oxygen in the blood). This increase in RBCs is known as erythrocytosis or polycythemia, and it helps to increase the amount of oxygen that can be transported to the body's tissues.
Last updated
About Circulation
The circulatory system covers the chambers, valves and conducting pathway of the human heart, along with the cardiac cycle and control of heartbeat. It compares arteries, veins and capillaries by structure and function, and explains how the lymphatic system returns tissue fluid, transports absorbed fats and supports immunity.
Practise Circulation
695 free Circulation MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Biology questions like this
Biology is on 6 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
1% of the absorbed water is used by plants in its activities during:
75% osmotic pressure of blood is maintained by:
A bottle filled with previously moistened mustard seeds and water was screw-capped tightly and kept in a corner. It blew up suddenly after about half an hour. The phenomenon involved is
A column of water within xylem vessels of tall trees does not break under its weight because of:
A destarched leaf on a potted plant was covered with Black (A) Transparent (B) strips of paper as shown in figure. After 6 hours of exposure to sunlight the leaf was removed from the plant and tested for starch. Which are the following will be the correct observation?