Chapter 7- Physiology of Sport and Exercise
Terms in this set (24)
Terminal air sac at the end of the bronchial tree in the lungs, where gas exchange takes place in the capillaries.
Arterial-mixed venous oxygen difference
The difference in oxygen content between arterial and mixed venous blood, which reflects the amount of oxygen removed by the whole body.
Arterial-venous oxygen difference
The difference in oxygen content between arterial and venous blood at the tissue level.
Boyle's gas law
The law stating that at a constant temperature, the number of gas molecules in a given volume depends on the pressure.
A principle that states the total pressure exerted by a mixture of gases is equal to the sum of the partial pressures of individual gases.
The process by which air is forced out of the lungs through relaxation of the inspiration muscles and elastic recoil of the lung tissue which increase the pressure in the thorax.
The process of bringing air into the lungs and resulting in exchange of gas between the alveoli and the capillary blood.
Law stating that the net diffusion rate of gas across a fluid membrane is proportional to the difference in partial pressure is proportional to the area of the membrane, and inversely proportional to the thickness of the membrane.
Law stating that gases dissolve in liquids in proportion to their partial pressures, depending also on their solubilities in the specific fluids and on the temperature.
The active process of involving the diaphragm and the external intercostal muscles that expands the thoracic dimensions and thus the lungs. The expansion decreases pressure in the lungs allowing outside air to rush in.
The exchange of gases between the blood and tissues.
A compound similar to hemoglobin, but found in muscle tissue, that carries oxygen from the cell membrane to the mitochondria.
Oxygen diffusion capacity
The rate at which oxygen diffuses from one place to another.
The pressure exerted by an individual gas in a mixture of gases.
The exchange of gases between the lungs and the blood.
The movement of gases into and out of the lungs.
The amount of air that cannot be exhaled from the lungs.
Autonomic centers located in the medulla oblongata and the pons that establish breathing rate and depth.
The membrane separating alveolar air and blood, composed of the alveolar wall, the capillary wall, and their basement membranes.
Passive movement of blood through the central circulation as a function of pressure changes during breathing.
The measurement of lung volumes and capacties.
The amount of air volume inspired or expired during a normal breathing cycle.
Total lung capacity
The sum of vital capacity and residual volume.
The maximal volume of air expelled from the lungs after maximal inhalation.
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