Which structure connects the ductus deferens to the urethra?

A. To ensure that the uterus is securely connected to the supporting ligaments: This is not the primary function of the middle layer (myometrium); rather, the supporting ligaments provide stability to the uterus.

B. To allow the uterus to shed tissue during menstruation: This is primarily the function of the endometrium, the inner layer of the uterine wall.

C. To allow the uterus to contract during childbirth to expel the fetus: The middle layer, known as the myometrium, is composed of smooth muscle that contracts during labor to help expel the fetus.

D. To provide the uterus with adequate space to grow a fetus: While the uterine structure allows for fetal growth, the myometrium’s primary role is in contractions rather than providing space.

A. Early spermatid: Early spermatids are haploid cells, round in shape, and have a central nucleus with a significant amount of cytoplasm.

B. Spermatogonium: Spermatogonia are diploid cells found in the basal layer of the seminiferous tubules and are not haploid.

C. Late spermatid: Late spermatids are more elongated and less round as they are close to maturing into sperm.

D. Primary spermatocyte: Primary spermatocytes are diploid cells that undergo meiosis to produce haploid spermatids.