It is a calculated pressure of a single gaseous species found in the mixture. In the atmosphere, every gas exerts different pressures that vary from each other. The total pressure of the gaseous mixture is the summation of all partial pressures of gases present in the mixture. Any specific gas would exert its pressure in any mixture and this behavior of the non-reactive gases in any mixture is described as Daltonâ€™s Law of Partial pressure. The exchange of gases occurs at two regions in our body, one is at the lungs and another site is at the tissues. Intake of oxygen and release of carbon dioxide happens from the respiratory membrane in the lungs. In the tissues, the vice versa happens, that is, the intake of carbon dioxide and release of oxygen.
External respiration happens when there is a gaseous exchange with the outside environment occurring in tiny air sacs of the lungs also known as Alveoli.
The differences in the partial pressure of oxygen and carbon dioxide of alveolar air and capillaries in the pulmonary contribute to the diffusion of Oâ‚‚ from the air into the blood capillaries in the pulmonary and the diffusion of COâ‚‚ in the opposite direction.
Deoxygenated blood is carried by the pulmonary artery from the heart into the lungs, where it forms a capillary network, which is made up of pulmonary capillaries. These capillaries create a membrane with the alveoli.
Blood is pumped through the network of capillaries which aids in the exchange of gases. Then, the oxygen is absorbed by red blood corpuscles that bind with hemoglobin pigment. The oxygenated blood returns to the heart through the pulmonary vein. P
artial pressure differences in both oxygen and carbon dioxide result in external respiration between alveoli and blood in pulmonary capillaries.
The PCOâ‚‚ in the blood of the capillary is about 45 mmHg as against 40 mmHg which is its partial pressure in the air sacs of the lungs.
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