How are gases exchange at alveolus and tissues with blood? Explain your answer by comparing the partial pressures at different parts.
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Answer:
Gas Exchange
LEARNING OBJECTIVES
By the end of this section, you will be able to:
Compare the composition of atmospheric air and alveolar air
Describe the mechanisms that drive gas exchange
Discuss the importance of sufficient ventilation and perfusion, and how the body adapts when they are insufficient
Discuss the process of external respiration
Describe the process of internal respiration
The purpose of the respiratory system is to perform gas exchange. Pulmonary ventilation provides air to the alveoli for this gas exchange process. At the respiratory membrane, where the alveolar and capillary walls meet, gases move across the membranes, with oxygen entering the bloodstream and carbon dioxide exiting. It is through this mechanism that blood is oxygenated and carbon dioxide, the waste product of cellular respiration, is removed from the body.
Answer:
The partial pressures of oxygen and carbon dioxide change as blood moves through the body. In short, the change in partial pressure from the alveoli to the capillaries drives the oxygen into the tissues and the carbon dioxide into the blood from the tissues