00:01
Hello students, the question or space describe the role and function of external and internal respiration and what is the mechanism of external and internal respiration in terms of partial pressures and explain how low partial pressure of oxygen affect the percent saturation of hemoglobin.
00:22
External respiration refers to the exchange of gases between lungs and blood.
00:37
While internal respiration refers to the exchange of gases between blood and body's tissue.
00:57
During external respiration, oxygen from the inhaled air diffuses across the respiratory membrane which is present in the lungs and into the bloodstream.
01:29
At the same time, carbon dioxide diffuses which is the waste product of the cellular respiration from blood into the lungs and is exhaled out of the body.
01:52
This exchange occurs due to the difference in partial pressure of oxygen and carbon dioxide between alveoli in the lungs and blood in the pulmonary capillary.
02:21
In case of internal respiration which occurs in the body's tissues, oxygen rich blood which comes from the lung is transported to the tissue through a systemic circulation.
02:46
In the tissues, oxygen diffuses from blood into the tissue cell and while carbon dioxide diffuses from cells into the blood.
03:16
This exchange is driven by difference in partial pressure of oxygen and carbon dioxide between blood and tissues.
03:32
This mechanism of gas exchange in both external and internal respiration is based on principle of partial pressure.
03:56
Partial pressure refers to the pressure which is exerted by a specific gas in a mixture of gases.
04:15
In the case of respiration, the partial pressure of oxygen which is po2 and the partial pressure of carbon dioxide play a crucial role.
04:31
In external respiration, the partial pressure of oxygen in alveoli is higher than the pulmonary capillary and creating a pressure difference or pressure gradient that drives oxygen to diffuse into the blood...