hormonal control of spermatogenesis

The parathyroids secrete a single hormone called parathormone (PTH).Parathormone and calcitonin from the thyroid gland act antagonistically to regulate the calcium phophorous balance in the blood.Parathormone regulates calcium metabolism and controls the amount of calcium in bl..

Hormones are the chemical messengers of the body. They are defined as organic substances secreted into blood stream to control the metabolic and biological activities. These hormones are involved in transmission of information from one tissue to another and from ..

The thyroid gland secretes three hormones Thyroxine or tetraiodothyroxine, triiodothyronine and calcitonin . Thyroxine and triiodothyronine are iodinated forms of the aminoacid tyrosine. They are stored in the colloid that fills the vesicles and are released to the blood when needed. ..

Hormonal Control of Digestion - Digestion is also controlled by the secretion of organic substances called hormones by the endocrine glands. Each hormone has a specific target organ. The hormones reach the target organ through the blood st..

Hormonal Control of Cyclic Changes in Ovaries and Uterus During Menstrual Cycle - The cyclic changes in the ovary and uterus are under the control of estrogen and progesterone hormones whose secretion is under the control of gonadotropic hormon..

Endocrine System - Hormonal Control - Glands are of two types: Exocrine glands Endocrine glands Exocrine and Endocrine Gland Showing Release of Secretion Exocrine glands are those which pour their secretions into a duct. For example, sweat glands, tear glands, etc. Endocrine gla..

. The secretions of the endocrine glands are called hormones . Hormones have the following characteristics: they may be proteinaceous or non-proteinaceous (amino acids or steroids) they are secreted as per need and not stored, only excreted their secretion may be regulated by ne..

Endocrine glands are those which are richly supplied with blood vessels and pour their secretions directly into the blood vessels. The secretions reach their target through blood. These glands are called the ductless glands as they do not have duct..

1) The hormones of the anterior pituitary gland namely LH (Leutinising hormone) and FSH (Follicle stimulating hormone) control the functioning of the female reproductive system. 2) The LH stimulates ovulation (rupture of the mature follicle to release ovum). ..

The period extending from birth up to 10 - 13 years is called childhood. During this period, the growth is very slow. Growth during this period is controlled by the hormone thymus, secreted by the thymosin gland. During puberty (between 14 - 18 years) there is enhanced activity ..