During spermatogenesis, one spermatogonia will become 4 separate functioning spermatozoa. In oogenesis, a primary oocyte will become 1 functioning ovum (or egg) while 3 polar bodies are also produced, which are nonfunctioning and never become eggs.

During spermatogenesis, one spermatogonia will become 4 separate functioning spermatozoa. In oogenesis, a primary oocyte will become 1 functioning ovum (or egg) while 3 polar bodies are also produced, which are nonfunctioning and never become eggs.

When a female ovulates, the oocyte is in metaphase II, until it becomes fertilized by a sperm. It then completes the second phase of meiosis to make a mature ovum. Remember that, unlike spermatogenesis, oogenesis begins during development. All oocytes undergo meiosis I during fetal development, and are kept suspended in prophase II until ovulation, when they shift to metaphase II. Meiosis only continues beyond metapahse II if fertilization occurs.

When a female ovulates, the oocyte is in metaphase II, until it becomes fertilized by a sperm. It then completes the second phase of meiosis to make a mature ovum. Remember that, unlike spermatogenesis, oogenesis begins during development. All oocytes undergo meiosis I during fetal development, and are kept suspended in prophase II until ovulation, when they shift to metaphase II. Meiosis only continues beyond metapahse II if fertilization occurs.

The menstrual cycle has four phases:

1. Menstrual phase (days 1-5): the uterus sheds its lining, which exits the body through the vagina in the form of menstrual fluid.

2. Follicular phase (days 1-13): the pituitary gland releases a hormone that stimulates the egg cells to grow. One egg cell matures in a sac-like follicle for 13 days; while it is maturing, the follicle releases a hormone that causes the uterus to develop its lining.

3. Ovulatory phase (day 14): the events listed in the question occur.

4. Luteal phase (days 15-28): the egg released during ovulation stays in the fallopian tube for 24 hours, disintegrating if not fertilized during that time. During this phase, the hormone that causes the uterus to retain its lining is used up, causing another menstrual phase to begin.

The menstrual cycle has four phases:

1. Menstrual phase (days 1-5): the uterus sheds its lining, which exits the body through the vagina in the form of menstrual fluid.

2. Follicular phase (days 1-13): the pituitary gland releases a hormone that stimulates the egg cells to grow. One egg cell matures in a sac-like follicle for 13 days; while it is maturing, the follicle releases a hormone that causes the uterus to develop its lining.

3. Ovulatory phase (day 14): the events listed in the question occur.

4. Luteal phase (days 15-28): the egg released during ovulation stays in the fallopian tube for 24 hours, disintegrating if not fertilized during that time. During this phase, the hormone that causes the uterus to retain its lining is used up, causing another menstrual phase to begin.

Oogenisis halts in the female embryo while the oocytes are trapped in meiosis II. At the beginning of the menstrual cycle a number of oocytes in primordial follicles are stimulated by pituitary gonadotropins to continue maturation.

Oogenisis halts in the female embryo while the oocytes are trapped in meiosis II. At the beginning of the menstrual cycle a number of oocytes in primordial follicles are stimulated by pituitary gonadotropins to continue maturation.

The corpus luteum is formed from the remainder of the follicle following ovulation. The corpus luteum will release estradiol (estrogen) and progesterone in order to prepare for pregnancy. If pregnancy does not take place, the corpus luteum will degrade into the corpus albicans.

The follicle contains the egg prior to ovulation and releases it after stimulation by follicle-stimulating hormone and luteinizing hormone from the anterior pituitary. Human chorionic gonadotropin (hCG) is the hormone responsible for maintaining the uterus and placenta during pregnancy, and is released by the uterus.

The corpus luteum is formed from the remainder of the follicle following ovulation. The corpus luteum will release estradiol (estrogen) and progesterone in order to prepare for pregnancy. If pregnancy does not take place, the corpus luteum will degrade into the corpus albicans.

The follicle contains the egg prior to ovulation and releases it after stimulation by follicle-stimulating hormone and luteinizing hormone from the anterior pituitary. Human chorionic gonadotropin (hCG) is the hormone responsible for maintaining the uterus and placenta during pregnancy, and is released by the uterus.