ATI RN
Questions on Respiratory System Questions
Question 1 of 5
Fick's law of diffusion is related to
Correct Answer: A
Rationale: Fick's law of diffusion states that the rate of diffusion is directly proportional to the surface area and concentration gradient, and inversely proportional to the distance over which diffusion occurs. Therefore, Choice A - Diffusion and Surface area is correct because surface area directly affects the rate of diffusion. Choices B, C, and D are incorrect as they do not directly relate to Fick's law. B is incorrect as membrane potential is not a factor in Fick's law. C is incorrect as water content is not a key factor in the law of diffusion. D is incorrect as pore diameter is not explicitly mentioned in Fick's law.
Question 2 of 5
During transportation of Carbon dioxide, blood will not become acidic, because
Correct Answer: C
Rationale: Rationale: Choice C is correct because blood contains buffers like bicarbonate that help maintain pH balance by neutralizing excess acids or bases. This prevents blood from becoming acidic during CO2 transportation. Choices A and B are incorrect as hemoglobin doesn't directly regulate blood pH, and hemoglobinc acid is not a component in blood. Choice D is incorrect as high CO2 levels can actually lead to blood becoming more acidic if not properly buffered.
Question 3 of 5
A patient has been diagnosed with pulmonary hypertension, in which the capillaries in the alveoli are squeezed excessively. The nurse should recognize a disturbance in what aspect of normal respiratory function?
Correct Answer: B
Rationale: The correct answer is B: Perfusion. Pulmonary hypertension affects blood flow through the lungs, leading to decreased perfusion. This results in inadequate oxygenation of the blood. Acid-base balance (A) is maintained by the kidneys and lungs, not directly impacted by pulmonary hypertension. Diffusion (C) refers to gas exchange in the alveoli, which is affected by perfusion but not the primary disturbance in pulmonary hypertension. Ventilation (D) is the process of moving air in and out of the lungs, which is not primarily affected by pulmonary hypertension; it is more related to conditions like COPD.
Question 4 of 5
A sensitized B cell is activated once:
Correct Answer: A
Rationale: The correct answer is A because a sensitized B cell requires activation by a helper T cell releasing cytokines to undergo differentiation and proliferation into plasma cells. This interaction is crucial for initiating the humoral immune response. Choices B, C, and D are incorrect because binding to a cytotoxic T cell, cloning of memory B cells, or cloning of plasma cells do not directly activate a sensitized B cell for its function in producing antibodies.
Question 5 of 5
The partial pressure of carbon dioxide in venous blood is approximately
Correct Answer: B
Rationale: The correct answer is B (45 mm Hg) because the partial pressure of carbon dioxide in venous blood is typically around 40-45 mm Hg. This value represents the amount of CO2 dissolved in the blood plasma. Option A (40 mm Hg) is slightly on the lower side and may not fully reflect the average value. Option C (50 mm Hg) is higher than the usual range for venous blood CO2 levels. Option D (70 mm Hg) is significantly higher than the normal range and is more characteristic of arterial blood CO2 levels. Therefore, option B is the most accurate representation of the partial pressure of CO2 in venous blood.