Final answer:
Beta blockers cause negative inotropy and increased SVR, and can mask hypoglycemia symptoms. They are not typically known to relax uterine muscle, which is the misinformation in the given options.
Step-by-step explanation:
The effects of beta blockers include various pharmacological actions on the body, however, some of the options listed in the question contain misinformation about their effects. As blockers of the effects of catecholamines like adrenaline, beta blockers typically have the opposite effect on heart rate and blood pressure. Specifically, they are known to cause negative inotropy, which is a decreased force of heart muscle contraction, and therefore can be used to treat high blood pressure and certain heart conditions.
Beta blockers also have an effect on metabolic processes, such as lipolysis, which is the breakdown of fats in adipose tissue. Generally, beta blockers decrease lipolysis, not enhance it, which contradicts information implied in the question. Furthermore, while some beta blockers can increase systemic vascular resistance (SVR) and mask symptoms of hypoglycemia, they do not typically relax uterine muscle; that is an effect of beta-2 adrenergic receptor activity, which is not generally inhibited by beta blockers used for cardiovascular purposes.
Based on this information, the correct answer to the student's question, "Which of the following is NOT a true effect of beta blockers?" would be 'A. Relax uterine muscle'.