Which of the following statements about the adrenergic recep

Which of the following statements about the adrenergic receptor is NOT true? Isoproterenol is an agonist for this receptor. The responses to the stimulation of some of these receptors include smooth muscle contraction increased heart rate and increased lipolysis. Propranolol is an agonist for this receptor. Beta-blockers work as antagonists for this receptor, thereby controlling heartbeat rate.

Solution

The following statement is not true about the adrenergic receptor:

Propranolol is an agonist for this receptor

Isoproterenol also known as Isoprenaline is a ₁ + ₂ receptors agonist which are adrenergic in nature.

Adrenergic receptors are positively involved with the smooth muscle contraction, Heart rate and lipolysis; since the stimulation of adrenergic receptors leads to increase in smooth muscle contraction, Heart rate and lipolysis.

Beta receptors are adrenergic receptors, so beta blockers will act as antagonists against adrenergic receptors, thereby controls the heart rate.