The most important mechanism for capillary exchange is?.
Diffusion.
Filtration.
Gravity.
Colloid osmotic pressure.
The Correct Answer is A
Choice A rationale:
Diffusion is the primary mechanism for capillary exchange. It allows small molecules, such as gases, lipids, and lipid-soluble molecules, to move directly through the membranes of the endothelial cells of the capillary wall.
Choice B rationale:
Filtration is a pressure-driven mechanism that moves volumes of fluid from an area of higher pressure in a capillary bed to an area of lower pressure in the tissues. However, it is not the primary mechanism for capillary exchange.
Choice C rationale:
Gravity does not play a direct role in capillary exchange.
Choice D rationale:
Colloid osmotic pressure is a type of pressure that interacts with hydrostatic pressure to drive fluid movement in capillaries. However, it is not the primary mechanism for capillary exchange.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
hoice A rationale:
Cilia do not propel air into the lungs, they are involved in moving mucus and trapped particles.
Choice B rationale:
Cilia do not trap food or prevent its entry into the windpipe. This is the role of the epiglottis, not cilia.
Choice C rationale:
Cilia in the airways help to propel trapped debris and mucus upward to be expelled by the body.
Choice D rationale:
Cilia do not have a role in olfaction or the sense of smell.
Correct Answer is C
Explanation
Choice A rationale:
The build-up of plaque in the arteries is a specific type of arteriosclerosis known as atherosclerosis.
Choice B rationale:
Aging of the arteries is not a precise definition of arteriosclerosis.
Choice C rationale:
Arteriosclerosis is characterized by the abnormal thickening, hardening, and loss of elasticity of the arteries.
Choice D rationale:
Stretching of the arteries is not a characteristic of arteriosclerosis.
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