Where does gas exchange occur?.
The alveoli.
The bronchioles.
The bronchus.
The lungs.
The Correct Answer is A
Choice B rationale:
The bronchioles are part of the airway that leads to the alveoli, but gas exchange does not occur here.
Choice C rationale:
The bronchus is a larger airway that leads to the bronchioles and then to the alveoli, but gas exchange does not occur here.
Choice D rationale:
While the lungs contain the alveoli where gas exchange occurs, saying that gas exchange occurs in the lungs is not as precise as saying it occurs in the alveoli.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A rationale:
Low blood viscosity is not the primary reason blood constantly circulates. It is the heart that creates the pressure increase in arteries that pushes blood through the body.
Choice B rationale:
Vasoconstriction and dilation are not the primary reasons blood constantly circulates. They are mechanisms that help regulate blood flow and pressure, but the constant circulation of blood is due to the beating of the heart.
Choice C rationale:
Pressure gradients play a role in blood circulation, but they are not the primary reason blood constantly circulates. The heart is the organ that creates the pressure increase in arteries that pushes blood through the body.
Choice D rationale:
The beating of the heart is the primary reason that blood constantly circulates throughout the body.
Correct Answer is A
Explanation
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.
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