Question

For erection to occur:

A) there must be sufficient blood hydrostatic pressure.
B) nitric oxide must be present.
C) the sacral spinal cord must be intact.
D) all of the above.
E) A and B only.

Answer 1

An erection requires sufficient blood hydrostatic pressure, the presence of nitric oxide, and an intact sacral spinal cord to initiate and maintain the physiological changes needed for this process.

Step-by-step explanation:

For erection to occur, D) all of the above elements are necessary:

A) there must be sufficient blood hydrostatic pressure to engorge the erectile tissues; B) nitric oxide (NO) must be present to induce the relaxation of the smooth muscles that surround the penile arteries, leading to vasodilation; and C) the sacral spinal cord must be intact to properly relay the nervous signals essential for initiating and maintaining an erection.