ATI RN
Multiple Choice Questions on Endocrine System Questions
Question 1 of 5
Terbutaline specifically stimulates:
Correct Answer: D
Rationale: Terbutaline specifically stimulates Beta2 receptors. This leads to bronchodilation by relaxing smooth muscles in the airways. Beta2 receptors are predominantly found in the lungs. Option A and B are incorrect as terbutaline does not target Alpha receptors. Option C is incorrect as terbutaline does not primarily stimulate Beta1 receptors, which are mainly found in the heart.
Question 2 of 5
Albuterol causes selective activation of β2 adrenergic receptors when administered in 'low doses,' mainly by inhalation. If very large doses of albuterol were given, or if the drug is administered intravenously, the effects caused by albuterol would look quite different and would resemble those of which one of the following drugs?
Correct Answer: B
Rationale: Step 1: Albuterol selectively activates β2 adrenergic receptors in low doses. Step 2: Isoprenaline is a non-selective beta-adrenergic agonist. Step 3: Very large doses of albuterol or IV administration would lead to non-selective activation of beta receptors. Step 4: Isoprenaline also activates both β1 and β2 receptors, causing a broad range of effects. Step 5: Therefore, the effects of high-dose albuterol would resemble those of Isoprenaline, making B the correct answer. Summary: Choice A (Epinephrine) is incorrect because epinephrine primarily acts on both α and β adrenergic receptors, not just β2. Choice C (Norepinephrine) is incorrect as it mainly acts on α adrenergic receptors, not β. Choice D (Phenylephrine) is incorrect because it is a
Question 3 of 5
Which row shows the correct labels on the diagram of a leaf section?
Correct Answer: A
Rationale: The correct answer is A because the cuticle is the waxy layer on the leaf surface, palisade mesophyll is the layer of elongated cells where photosynthesis occurs, and stoma is the opening for gas exchange. Epidermis is the outer layer, not the cuticle. Spongy mesophyll is below palisade mesophyll, not above it. Guard cells surround stomata, not spongy mesophyll.
Question 4 of 5
What is the mass of hydrogen chloride that reacts with 5.1 g of ammonia?
Correct Answer: B
Rationale: To find the mass of hydrogen chloride that reacts with 5.1g of ammonia, we need to use the stoichiometry of the balanced chemical equation. The balanced equation for the reaction between ammonia (NH3) and hydrogen chloride (HCl) is: NH3 + HCl → NH4Cl From the equation, we can see that 1 mole of NH3 reacts with 1 mole of HCl to form 1 mole of NH4Cl. Therefore, the molar ratio of NH3 to HCl is 1:1. First, we need to convert the given mass of ammonia (5.1g) to moles using the molar mass of ammonia (17g/mol): 5.1g NH3 * (1 mol NH3 / 17g NH3) = 0.3 mol NH3 Since the molar ratio of NH3 to HCl is 1:1, the moles of HCl that react with
Question 5 of 5
Which equation is used to calculate the power P of the machine?
Correct Answer: C
Rationale: The correct equation for calculating power is P = ΔE / t. Power is defined as the rate at which work is done or energy is transferred. In this equation, ΔE represents the change in energy and t represents the time taken for that change. Dividing the change in energy by the time gives us the power. This equation aligns with the fundamental definition of power. Choice A (P = ΔE × t) is incorrect because it implies that power is directly proportional to both the change in energy and time, which is not always the case. Choice B (P = W × t) is incorrect because it incorrectly uses work (W) in the equation for power, while power is specifically related to the rate at which work is done, not the work itself. Choice D (P = W / ΔE) is incorrect because it suggests power is inversely proportional to the change in energy, which is not a characteristic of power.