Which of the following is NOT a primary effect of blocking muscarinic receptors?

Blocking muscarinic receptors primarily results in a range of physiological effects associated with reduced activity of the parasympathetic nervous system. One of the key roles of muscarinic receptors is to facilitate various functions such as secretion and smooth muscle contraction in organs innervated by the parasympathetic system.

Increased heart rate occurs because blocking muscarinic receptors inhibits the vagal tone that normally works to lower heart rate. Consequently, this leads to an increased heart rate.

Decreased salivation is another effect of muscarinic receptor blockade. Anticholinergic agents reduce the stimulation of salivary glands by preventing acetylcholine from binding to muscarinic receptors, leading to dry mouth.

Decreased bronchial secretions align with the actions of anticholinergic agents, as blocking muscarinic receptors reduces the secretion of mucus in the airways.

However, increased gastrointestinal motility is not an effect of blocking muscarinic receptors. In fact, the inhibition of these receptors typically leads to a decrease in gastrointestinal motility. The normal activity of the parasympathetic nervous system promotes gastrointestinal function, and blocking this system can slow down processes such as peristalsis and secretion in the digestive tract. Thus, increased gastrointestinal motility