Partial pressure for oxygen and $CO_2$ is represented as

Constant flow of $CO_2$ from the tissues into the blood is due to

People living at sea level have around $5$ million $RBC$ per cubic millimeter of their blood,whereas those living at an altitude of $5400$ metres have around $8$ million. This is because at high altitude:

Which of the following factors affect the rate of diffusion?

Maximum amount of oxygen is lost from the blood in the

Which of the following is correct regarding the partial pressures of gases ($PO_2$ and $PCO_2$) in different parts of the human respiratory system?