How veins and arteries contribute to erection
Erections are triggered by influx of blood into the penis.
The penis is like a bathtub
to be filled for erections to ocure.
Normal erection
To fill-up the bathtub, water must arrive through the tap (arteries), and remain in the bathtub (blocked veins).
Impotence due to
vein leakage
Vein leakage =
No erection
Water arrives through the tap but escapes at the bottom (venous leakage). Bathtub never gets filled-up.
Impotence due to
arterial disease
Clogged arteries =
No erection
Water does not arrive through the tap. Bathtub does not fill-up.