Tadalafil is a _____ inhibitor

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Multiple Choice

Tadalafil is a _____ inhibitor

Explanation:
The main idea is how erection is controlled by the NO–cGMP pathway and how a PDE5 inhibitor works in that pathway. Nitric oxide released during sexual stimulation raises cGMP in the smooth muscle of the corpus cavernosum, causing relaxation and increased blood flow. Phosphodiesterase type 5 (PDE5) is the enzyme that degrades cGMP in this tissue. Inhibiting PDE5 with tadalafil slows the breakdown of cGMP, so the NO-driven signal lasts longer and the erection is enhanced in response to sexual stimulation. This selective action is what makes tadalafil a PDE5 inhibitor—the other enzymes listed (PDE1, PDE2, PDE3) have different roles and tissue distributions, so inhibiting them wouldn’t produce the same targeted effect on penile smooth muscle.

The main idea is how erection is controlled by the NO–cGMP pathway and how a PDE5 inhibitor works in that pathway. Nitric oxide released during sexual stimulation raises cGMP in the smooth muscle of the corpus cavernosum, causing relaxation and increased blood flow. Phosphodiesterase type 5 (PDE5) is the enzyme that degrades cGMP in this tissue. Inhibiting PDE5 with tadalafil slows the breakdown of cGMP, so the NO-driven signal lasts longer and the erection is enhanced in response to sexual stimulation. This selective action is what makes tadalafil a PDE5 inhibitor—the other enzymes listed (PDE1, PDE2, PDE3) have different roles and tissue distributions, so inhibiting them wouldn’t produce the same targeted effect on penile smooth muscle.

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