A and P II long essays

# A and P II long essays - Exam II long essays 1 Explain...

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Exam II long essays 1. Explain partial pressure and movement of O2 and CO2 during internal and external respiration Just before each breathe, the air pressure inside the lungs is equal to the air pressure of the atmosphere, which is about 760 mmHg at sea level. For air to flow into the lungs, the pressure inside the alveoli must become lower than the atmospheric pressure. This is achieved by changing the volume of the lungs. Boyles law- inverse relationship between volume and pressure Daltons Law- each gas in a mixtures of gases exerts its own pressure as it no other gases were present. The pressure of the specific gas in a mixture is called its partial pressure. The total pressure of the mixture is calculated by adding all the partial pressures. o Each gas diffuses across a permeable membrane from the area where its partial pressure is greater to an area where its partial pressure is less. The greater the difference in partial pressure, the faster the rate of diffusion External respiration is the diffusion of O2 from air in the alveoli of the lungs to blood in the pulmonary capillaries and the diffusion of CO2 in the opposite direction. External respiration in the lungs converts deoxygenated blood coming from the right side of the heart into oxygenated blood that returns to the left side of the heart. As blood flows through the capillaries, it picks up O2 from alveolar air and unlods CO2 into alveolar air. Each gas diffuses independently from the area where its partial pressure is higher to the area where its partial pressure is lower. O2 diffuses from alveolar air where its partial pressure is 105 mmHg into the blood in

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## This note was uploaded on 04/18/2008 for the course BIO 3040 taught by Professor Carr during the Spring '08 term at Palm Beach Atlantic University.

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A and P II long essays - Exam II long essays 1 Explain...

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