Reproductive system cells that synthesize steroid hormones

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The corpus albicans is formed after the corpus luteum stops producing hormones and a new cycle begins. It is a fibrous mass that is broken down by macrophages in the ovary. Histologically it is very large and a predominant feature of the ovary. Follicular atresia occurs in all of the developing follicles that do not become the dominant follicle. It involves a thickening of the basement membrane between the theca interna and granulosa cells. Because of the smooth appearance of its thickened basement membrane, atretic follicles are also called the glassy membrane. Atretic follicles are generally much smaller than the corpus albicans.

Fertilization -UNIQUE1-Fertilization_MED_ANI_EN-UNIQUE2- Once every month or so, a woman’s ovary releases an egg cell. This process, known as ovulation, usually occurs about 14 days after the start of the woman’s last menstrual period, if she has a normal 28-day menstrual cycle. The egg cell is swept through the fallopian tube, which runs from the ovary to the uterus. The egg cell slows in the longest and widest part of the fallopian tube. This is where the egg cell is fertilized by a man’s sperm cell.

The production of sperm cells is known as spermatogenesis . This process occurs continuously and takes place within the male testes. Hundreds of millions of sperm must be released in order for fertilization to take place. Oogenesis (ovum development) occurs in the female ovaries. In meiosis I of oogenesis, daughter cells are divided asymmetrically. This asymmetrical cytokinesis results in one large egg cell (oocyte) and smaller cells called polar bodies. The polar bodies degrade and are not fertilized. After meiosis I is complete, the egg cell is called a secondary oocyte. The haploid secondary oocyte will only complete the second meiotic stage if it encounters a sperm cell and fertilization begins. Once fertilization is initiated, the secondary oocyte completes meiosis II and is then called an ovum. The ovum fuses with the sperm cell, and fertilization is complete. The fertilized ovum is called a zygote.

Ejaculation is the term for the contractions that release semen. This is a reflex action, which means it is not consciously controlled. As part of the reflex action, the opening that drains the bladder is closed. This means that urine is not released at the same time as semen. The volume of semen in a typical ejaculation is between -5 millilitres (mL). There are normally more than 20 million sperm in each mL of semen. During sexual intercourse, the penis of the male enters the vagina of the female, carrying the sperm to the neck of the womb (cervix) to fertilise the woman's egg.

Reproductive system cells that synthesize steroid hormones

reproductive system cells that synthesize steroid hormones

The production of sperm cells is known as spermatogenesis . This process occurs continuously and takes place within the male testes. Hundreds of millions of sperm must be released in order for fertilization to take place. Oogenesis (ovum development) occurs in the female ovaries. In meiosis I of oogenesis, daughter cells are divided asymmetrically. This asymmetrical cytokinesis results in one large egg cell (oocyte) and smaller cells called polar bodies. The polar bodies degrade and are not fertilized. After meiosis I is complete, the egg cell is called a secondary oocyte. The haploid secondary oocyte will only complete the second meiotic stage if it encounters a sperm cell and fertilization begins. Once fertilization is initiated, the secondary oocyte completes meiosis II and is then called an ovum. The ovum fuses with the sperm cell, and fertilization is complete. The fertilized ovum is called a zygote.

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