The reproduction

Reproduction
The process of sexual reproduction is the fusion of special cells from different individuals of the same species, one male and one female. These cells are called gametes and have a haploid number of chromosomes. They are formed in the gonads (sex organs primary). The male gametes (spermatozoa) are formed in the testicles. The female gametes (eggs) are formed in the ovaries. Fertilization is the penetration of sperm into the egg, fusion of their nuclei to form the nucleus of the zygote. The fertilized egg descends into the uterus through the uterine epithelium and is tucked inside the endometrial wall. There he forms the placenta, the organ through which physiological exchange be held between the embryo and mother during the remainder of the pregnancy.

Endocrine regulation of reproduction

There is a delicate adjustment device based on mutual influences and is the responsibility of the endocrine and nervous systems. Ovulation in the female results from a predominance of L on FSH and coincides with maximum estrogen secretion. After downloading the ovum, progesterone inhibits gonadotropin secretion by the pituitary gland, thereby preventing the start of the maturation of a new batch of ovarian follicles.

If the egg is not fertilized, the corpus luteum degenerates and causes destruction and unloading the hypertrophied endometrial layers by ovarian hormones, which is accompanied by bleeding (menstruation). If the egg is fertilized, the uterus informs the hypothalamus and this affects the adenohypophysis, which adapts the functionality of the ovary to the requirements of this state. Childbirth is caused by the action of occitocina on the uterine muscle. The development of glandular breast tissue was in charge of estrogen and progesterone. Now prolactin stimulates milk formation and causes their expulsion occitocina.

*Automatic Translation