know how oxygen moves into the alveolus from the air (partial pressure) and how
ID: 3479589 • Letter: K
Question
know how oxygen moves into the alveolus from the air (partial pressure) and how each carbon dioxide moves from the blood into the alveolus (again, partial pressure). Know the function of internal and external intercostal muscles in respiration. Know the effect of inspiration and expiration on the diaphragm and lungs Know what a pneumothorax is and what causes it. . Know what the atmospheric pressure is in mm-Hg and what happens in respiration if this value was above or below . Again, know what happens if the thoracic cavity increases, decreases. What does this mean for the diaphragm and for overall respiration? (see videos if you are lost) . Know type I alveolar cells vs type II . What is surfactant? What is its function? Which cells produce this?Explanation / Answer
Three processes are essential for the transfer of oxygen from the outside air to the blood flowing through the lungs: ventilation, diffusion, and perfusion.
Ventilation is the process by which air moves in and out of the lungs.
Diffusion is the spontaneous movement of gases, without the use of any energy or effort by the body, between the gas in the alveoli and the blood in the capillaries in the lungs.
Perfusion is the process by which the cardiovascular system pumps blood throughout the lungs.
- intrapleural pressure - 754 mmHg
Alveolar pressure is less than atmospheric pressure, so air is going to move from the atmosphere into the lungs
2. During exhalation (diaphragm relaxing, decreasing the volume of the thoracic cavity)
- atmospheric pressure - 760 mmHg
- alveolar pressure - 762 mmHg
- intrapleural pressure - 756 mmHg
Alveolar pressure is greater than atmospheric pressure, so air is going to move out of the lungs and into the atmosphere
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