Propranolol produces all of the following actions EXCEPT:

Correct Answer: D

Rationale: Propranolol is a non-selective beta-blocker which primarily affects the heart. Bronchodilation is not a common effect of propranolol due to its non-selectivity for beta-2 receptors in the lungs. Therefore, choice D is the correct answer. Choices A, B, and C are correct because propranolol typically causes negative inotropic effect (reduced force of heart contraction), negative chronotropic effect (slowing of heart rate), and slowing of A-V conduction (delay in electrical signal between atria and ventricles), respectively.

Correct Answer: C

Rationale: The correct answer is C: Bronchodilation. Beta-blockers primarily work by blocking the beta-adrenergic receptors, leading to a decrease in heart rate and contractility. This can result in adverse effects such as hypotension, heart failure, and heart block due to the reduced cardiac output. However, bronchodilation is not a typical adverse effect of beta-blockers. In fact, beta-blockers can cause bronchoconstriction in patients with underlying respiratory conditions like asthma, making choice C the correct answer. Choices A, B, and D are incorrect because hypotension, heart failure, and heart block are known adverse effects associated with beta-blockers due to their mechanism of action on the cardiovascular system.

Correct Answer: C

Rationale: The correct answer is C: Propranolol. Verapamil is a calcium channel blocker that can depress heart rate and contractility. Propranolol is a beta-blocker that also decreases heart rate and contractile force. When combined, both drugs can have an additive effect leading to a significant decrease in heart rate and contractility, potentially causing bradycardia or heart failure. Albuterol (A) is a beta-2 agonist that actually increases heart rate and contractility. Scopolamine (B) is an anticholinergic drug that may decrease heart rate, but its effect is not as significant as propranolol. Isoproterenol (D) is a beta agonist that increases heart rate and contractility, so its combination with verapamil would not pose the same risk as propranolol.

Correct Answer: C

Rationale: The correct answer is C because active transport involves the movement of particles from low concentration to high concentration, which goes against the natural flow of diffusion and requires energy input. In active transport, cells use ATP to pump substances across the cell membrane against their concentration gradient. This process allows cells to accumulate essential molecules or ions that are needed in higher concentrations inside the cell. Choices A, B, and D all describe passive transport processes where particles move with the concentration gradient and do not require energy input.

Correct Answer: A

Rationale: The correct formula for aluminium sulfate is Al2(SO4)3. This is because aluminium has a 3+ charge while sulfate has a 2- charge, requiring two aluminium ions to balance three sulfate ions. Choice B (Al2(SO3)4) is incorrect because sulfate ions have a 2- charge, not sulfite ions (SO3). Choices C (Al4(SO4)2) and D (Al4(SO3)2) have incorrect subscripts for the elements, not following the correct charge balance.