Question

damage to the glossopharyngeal nerve would likely cause

increase in heart rate.

problems in sexual arousal.

urine retention.

a reduction in saliva.

visual problems.

Explanation:

The glossopharyngeal nerve (CN IX) has functions related to salivation. It innervates the parotid salivary gland. Damage to it would affect salivation.

• The glossopharyngeal nerve is not directly related to regulating heart rate (that's more related to the vagus nerve in some aspects).
• Sexual arousal is mainly related to the autonomic nervous system (parasympathetic and sympathetic) in a more complex way not directly tied to the glossopharyngeal nerve.
• Urine retention is related to the bladder - related nerves (like pelvic splanchnic nerves etc.).
• Visual problems are related to the optic nerve (CN II) and other visual - pathway related nerves.

Answer:

a reduction in saliva.