Semen is

A) produced solely by the testis.
B) a vaginal secretion needed to activate sperm cells.
C) sperm cells plus the secretions of accessory glands.
D) responsible for engorgement of erectile tissue of the penis.
E) is composed only of sperm cells.

Semen

The male reproductive fluid containing spermatozoa and secretions from the seminal vesicles, prostate, and other glands, facilitating fertilization.

Accessory Glands

Glands that support the functioning of primary organs, especially in the reproductive system, such as seminal vesicles and prostate gland in males, and Bartholin's glands in females.

Erectile Tissue

Spongy tissue that can fill with blood to make an organ stiff and erect, found in parts of the body such as the penis and clitoris.