Sildenafil (Viagra) Achieves Its Therapeutic Action in the Treatment of Erectile

Multiple Choice

Sildenafil (Viagra) achieves its therapeutic action in the treatment of erectile dysfunction by :

A) enhancing neuronal stimulation of the amygdala in the brain.
B) stimulating parasympathetic receptors in the nerve fibers leading to the sexual organs.
C) stimulating sympathetic receptors in the nerve fibers leading to the sexual organs.
D) relaxing vascular smooth muscle, which increases blood flow to the corpus cavernosum.