Final answer:
Norepinephrine is used to treat hypotension and bradycardia as it can raise blood pressure and increase heart rate. Epinephrine, not NE, is used to counteract anaphylaxis and allergic reactions.
Step-by-step explanation:
Norepinephrine (NE) is an important neurotransmitter and hormone involved in various physiological processes. It binds to beta-1 adrenergic receptors, affecting heart rate and blood pressure. NE is used medicinally to treat certain conditions related to these effects. Among the options provided, NE is ideal in situations of hypotension and bradycardia (option b). In cases of hypotension, NE can raise blood pressure, and its beta-1 receptor activity can help address bradycardia by increasing heart rate.
Epinephrine, a related compound, is the choice drug to counteract the effects of anaphylactic shock, due to its ability to raise blood pressure and relax bronchial smooth muscle. Anaphylaxis and allergic reactions are treated with epinephrine, not NE. Therefore, option b, hypotension and bradycardia, is the correct choice when considering the use of NE.