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Spermatogenesis

The process occurring in the seminiferous tubules of the testes that results in four spermatozoa from one spermatogonium.

Oogenesis

The process occurring in the ovaries that produces one ovum and three polar bodies from each primary oocyte due to asymmetric division.

Continuous Process

Spermatogenesis occurs continuously throughout a male's life after puberty.

Cyclic Process

Oogenesis is cyclic and involves long pauses, with primary oocytes arrested in prophase I until puberty.

Sperm Size

Sperm are small and motile.

Ovum Size

Ova are larger and non-motile.

Metaphase II

The stage at which the oocyte is arrested during ovulation.

Duration of Spermatogenesis

Takes about 64 to 72 days from spermatogonia to mature spermatozoa.

Diploid Gametes

If meiosis produced diploid gametes, each would have 46 chromosomes, leading to potential genetic abnormalities.

Meiosis I

The first division in meiosis, including prophase I, metaphase I, anaphase I, and telophase I.

Meiosis II

The second division in meiosis, similar to mitosis, resulting in four haploid cells.

Mitosis

A process of cell division resulting in two identical daughter cells.

Pelvic Plexus

The nerve network innervating the reproductive systems, affecting sexual function and reproductive organ functions.

Ovaries

The primary source of estrogen and progesterone in females.

Testes

The primary male sex organs responsible for producing sperm and hormones like testosterone.

Scrotum Function

Regulates testicular temperature for effective sperm production.

Acrosome

A cap-like structure on the sperm head containing enzymes for penetrating the oocyte's protective layer.

LH Surge

Triggers ovulation and the transformation of the ruptured follicle into the corpus luteum.

Fertilization Site

Usually occurs in the ampulla of the fallopian tube.

Endometrium

The functional layer shed during menstruation, while the basal layer remains for regeneration.

Leydig Cells

Cells that produce testosterone in response to luteinizing hormone (LH).

Proliferative Phase

The phase when the functional layer of the endometrium rebuilds under estrogen influence.

Chlamydia trachomatis

The most common bacterial STD in the U.S., often asymptomatic.

Secondary Oocyte

The cell type released during ovulation, arrested in metaphase II.

Sperm Flow

The path of sperm from seminiferous tubules to urethra.

Homologous Structures

The penis is homologous to the clitoris, sharing similar embryonic origins.

Hormonal Cascade

The sequence of hormone release starting from the hypothalamus to stimulate sperm and testosterone production.

Progesterone Production

Occurs in the corpus luteum after ovulation, influenced by LH.

Sperm Production

Takes place in the seminiferous tubules within the testes.

Ovulation Timing

Typically occurs around day 14 of a 28-day menstrual cycle.

Estrogen Role

Responsible for the development of secondary sexual characteristics in women.

Orchiectomy Effects

Removal of testes before puberty prevents the development of secondary sex characteristics due to lack of testosterone.