Capillaries release oxygen and take up carbon dioxide from surrounding tissues through the process of?.
Osmosis.
Diffusion.
Filtration.
Colloid osmotic pressure.
.
The Correct Answer is B
Choice A rationale:
Osmosis is the process by which water molecules move from an area of high concentration to an area of low concentration across a semi-permeable membrane. It does not directly involve the exchange of oxygen and carbon dioxide in capillaries.
Choice B rationale:
Diffusion is the process by which molecules move from an area of high concentration to an area of low concentration. 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.
Choice C rationale:
Filtration is a process that separates particles from a liquid or gas, and it does not directly involve the exchange of oxygen and carbon dioxide in capillaries.
Choice D rationale:
Colloid osmotic pressure refers to the pressure exerted by proteins in a blood vessel’s plasma that usually tends to pull water into the circulatory system. It does not directly involve the exchange of oxygen and carbon dioxide in capillaries.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
The correct answer is Choice B.
Choice A rationale:
Venules are small vessels that collect blood from the capillaries and transport it to the veins. They are not primarily involved in the exchange of nutrients, wastes, and hormones.
Choice B rationale:
Capillaries are tiny vessels that branch out from arterioles to form networks around body cells. They are the primary sites for the exchange of gases, nutrients, and waste between blood and tissues.
Choice C rationale:
Arterioles are small branches of arteries that lead to capillaries. They primarily regulate blood pressure and blood flow, not the exchange of substances.
Choice D rationale:
Veins carry deoxygenated blood back to the heart. They are not the primary sites for substance exchange.
Correct Answer is C
Explanation
The correct answer is Choice C. -
Choice A rationale:
The bicuspid valve, also known as the mitral valve, prevents backflow from the left ventricle to the left atrium. -
Choice B rationale:
The semilunar valves include the aortic and pulmonary valves, but neither prevents backflow into the right atrium. -
Choice C rationale:
The tricuspid valve prevents backflow from the right ventricle to the right atrium. -
Choice D rationale:
The aortic valve prevents backflow from the aorta to the left ventricle.
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