Question

What is the antagionist of beta 1 adrenergic receptors of the sympathetic nervous system? A) They are primarily found in smooth muscles, regulating involuntary movements. B) They are responsible for increasing heart rate and the force of heart contractions. C) They control pupil dilation and are crucial for vision in low light conditions. D) They are involved in the regulation of blood glucose levels and insulin production.

Answer 1

The antagonist of beta 1 adrenergic receptors of the sympathetic nervous system is responsible for increasing heart rate and the force of heart contractions. Hence option B is correct.

Step-by-step explanation:

Beta 1 adrenergic receptors are primarily found in the heart. When these receptors are activated by the neurotransmitter norepinephrine (or epinephrine), it leads to increased heart rate (chronotropy) and increased force of heart contractions (inotropy). These effects are part of the sympathetic nervous system's "fight or flight" response, preparing the body for increased activity.

An antagonist of beta 1 adrenergic receptors would block or inhibit the effects mediated by these receptors. Such antagonists are commonly used in medicine for conditions like hypertension, angina, and certain cardiac arrhythmias. They work by reducing the stimulatory effects of the sympathetic nervous system on the heart, helping to decrease heart rate and cardiac output. thus option B is correct.