Write down the role of luteinizing hormone in male and female respectively

Menstruation is the shedding of the lining of the uterus (endometrium) accompanied by bleeding. It occurs in approximately monthly cycles throughout a woman's reproductive life, except during pregnancy. Menstruation starts during Puberty in Girls Puberty is a sequence of events in which physical changes occur, resulting in adult physical characteristics and capacity to reproduce. These physical changes are regulated by changes in the... read more (at menarche) and stops permanently at Menopause Menopause is the permanent end of menstrual periods and thus of fertility. For up to several years before and just after menopause, estrogen levels fluctuate widely, periods become irregular... read more . (Menopause is defined as 1 year after the last menstrual cycle.) By definition, the menstrual cycle begins with the first day of bleeding, which is counted as day 1. The cycle ends just before the next menstrual period. Menstrual cycles normally range from about 24 to 38 days. Only 10 to 15% of women have cycles that are exactly 28 days. Also, in at least 20% of women, cycles are irregular. That is, they are longer or shorter than the normal range. Usually, the cycles vary the most and the intervals between periods are longest in the years immediately after menstruation starts (menarche) and before menopause. Normally, menstrual bleeding lasts 4 to 8 days. Blood loss during a cycle usually ranges from 1/5 to 2 1/2 ounces. A sanitary pad or tampon, depending on the type, can hold u...

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In males, luteinising hormone (LH) stimulates the synthesis and secretion of hormones called androgens from testis. Androgens along with FSH (Follicle Stimulating Hormone) regulate spermatogenesis. In females, LH induces ovulation of fully mature follicles (Graafian follicles) and maintains the corpus luteum, formed from the remnants of the Graafian follicles after ovulation which secretes progesterone. Q. Testosterone is a steroid hormone produced by all vertebrate animals and, in humans and other mammals, it is secreted in large amounts by the testes of males and to a much lesser extent, the ovaries of females. In adult males, testosterone plays a key role in the development of reproductive organs and it promotes the secondary sexual characteristics of body and facial hair, increased muscle and bone mass, and a deep voice. Testosterone, like all hormones, works via long distance signaling and is regulated by other hormones as illustrated below: Figure 1: Testosterone regulation by cooperation between the hypothalamus, pituitary, and testicular endocrine glands. The major regulatory hormones involved are luteinizing hormone (LH), follicle-stimulating hormone (FSH) and gonadotropin-releasing hormone (GnRH). When testosterone levels are low, gonadotropin-releasing hormone (GnRH) is released by the hypothalamus, which in turn stimulates the pituitary gland to release FSH and LH. FSH and LH then stimulate the testis to produce testosterone. How is homeostasis achieved when te...

What is Luteinizing hormone? Luteinising hormones are called gonadotropic hormones, which are produced and released by the group of cells of the anterior pituitary gland. It is one of the main hormones that control the reproductive system by controlling the function of female reproductive organs – ovaries and male reproductive organs – testes. LH is formed in the pituitary gland, and binds with receptors in the hypothalamus before it is released into the bloodstream. It then makes its way to the ovaries. Our body maintains the level of LH in the blood cells, but an increase in estrogen creates a spike in luteinizing hormone, which triggers ovulation – the release of a female egg cell from an ovary. Also Read: In males, the luteinizing hormone triggers the production and secretion of hormones known as androgens from the testes. Along with the secretion of androgens and Follicle Stimulating Hormone (FSH), this hormone also controls spermatogenesis. In females, the luteinizing hormone causes ovulation of the Graafian follicles and also maintains the corpus luteum, which is developed from the traces of the Graafian follicles after the ovulation process that produces progesterone. Also Read: Functions of Luteinizing hormone • It is responsible for ovulation in females. • It plays a crucial role in the menstrual cycle. • It is responsible for the production of sperm in males. • LH stimulates estrogen and progesterone production from the ovary. • It subsequently stimulates the co...

Learning Objectives By the end of this section, you will be able to: • Explain the interrelationships of the anatomy and functions of the hypothalamus and the posterior and anterior lobes of the pituitary gland • Identify the two hormones released from the posterior pituitary, their target cells, and their principal actions • Identify the six hormones produced by the anterior lobe of the pituitary gland, their target cells, their principal actions, and their regulation by the hypothalamus The hypothalamus–pituitary complex can be thought of as the “command center” of the endocrine system. This complex secretes several hormones that directly produce responses in target tissues, as well as hormones that regulate the synthesis and secretion of hormones of other glands. In addition, the hypothalamus–pituitary complex coordinates the messages of the endocrine and nervous systems. In many cases, a stimulus received by the nervous system must pass through the hypothalamus–pituitary complex to be translated into hormones that can initiate a response. The hypothalamus is a structure of the diencephalon of the brain located anterior and inferior to the thalamus (Figure 1). It has both neural and endocrine functions, producing and secreting many hormones. In addition, the hypothalamus is anatomically and functionally related to the pituitary gland (or hypophysis), a bean-sized organ suspended from it by a stem called the infundibulum (or pituitary stalk). The pituitary gland is cradl...

A luteinizing hormone test measures how much luteinizing hormone a person has in their blood. This is a hormone with key roles in both male and female reproductive systems. Luteinizing hormone (LH) is involved in many bodily processes, including pregnancy, This article explores the uses of LH tests. It discusses high, low, and normal LH levels, as well as what they mean and how they relate to pregnancy. Share on Pinterest An LH test involves taking a blood sample. An LH test is a type of blood test that measures a person’s LH levels. LH is made in the pituitary gland of the brain. LH is a sex hormone that affects how a person’s reproductive organs work. In females, LH affects the ovaries. In males, it affects the testes. Reproductive health problems can affect a person’s LH levels. LH is involved in the following bodily processes: • Puberty: LH levels affect the onset of puberty. High LH levels may cause early puberty and low LH levels may delay puberty. • Menstruation: LH works with another sex hormone called follicle-stimulating hormone (FSH) to control menstrual cycles. • Ovulation: An increase in LH, called an LH surge, triggers the release of an egg from an ovary. • Progesterone release: An increase in LH triggers ovulation. The cell structure that is left after ovulation releases • Testosterone production: LH binds to Leydig cells in the testes and triggers • Sperm production: Testosterone, which LH levels affect, is needed for sperm production. We explore the variou...

https://med.libretexts.org/@app/auth/3/login?returnto=https%3A%2F%2Fmed.libretexts.org%2FBookshelves%2FAnatomy_and_Physiology%2FAnatomy_and_Physiology_(Boundless)%2F26%253A_The_Reproductive_System%2F26.4%253A_Physiology_of_the_Male_Reproductive_System%2F26.4E%253A_Hormonal_Regulation_of_the_Male_Reproductive_System \( \newcommand\) • • • • • • • • • • The male reproductive system is regulated by the production, stimulation, and feedback of specific hormones. Key Points • GnRH is made in the hypothalamus and travels to the pituitary where it stimulates FSH and LH secretion. • FSH is necessary for sperm maturation. • LH binds to Leydig cells to stimulate testosterone secretion and androgen production. • Testosterone stimulates sex drive. • Inhibin acts as negative feedback to slow the release of FSH and GnRH. Key Terms • GnRH: Gonadotropin-releasing hormone is a trophic peptide hormone responsible for the release of follicle-stimulating hormone (FSH) and luteinizing hormone (LH) from the anterior pituitary. • LH: Luteinizing hormone is produced by the anterior pituitary gland and in males causes the synthesis and secretion of testosterone and androgen. • FSH: Follicle-stimulating hormone stimulates both the production of androgen-binding protein by Sertoli cells and the formation of the blood-testis barrier. Hormonal control of spermatogenesis varies among species. In humans, the mechanisms are not completely understood. However, it is known that initiation of spermatogenesi...

Menstruation is the shedding of the lining of the uterus (endometrium) accompanied by bleeding. It occurs in approximately monthly cycles throughout a woman's reproductive life, except during pregnancy. Menstruation starts during Puberty in Girls Puberty is a sequence of events in which physical changes occur, resulting in adult physical characteristics and capacity to reproduce. These physical changes are regulated by changes in the... read more (at menarche) and stops permanently at Menopause Menopause is the permanent end of menstrual periods and thus of fertility. For up to several years before and just after menopause, estrogen levels fluctuate widely, periods become irregular... read more . (Menopause is defined as 1 year after the last menstrual cycle.) By definition, the menstrual cycle begins with the first day of bleeding, which is counted as day 1. The cycle ends just before the next menstrual period. Menstrual cycles normally range from about 24 to 38 days. Only 10 to 15% of women have cycles that are exactly 28 days. Also, in at least 20% of women, cycles are irregular. That is, they are longer or shorter than the normal range. Usually, the cycles vary the most and the intervals between periods are longest in the years immediately after menstruation starts (menarche) and before menopause. Normally, menstrual bleeding lasts 4 to 8 days. Blood loss during a cycle usually ranges from 1/5 to 2 1/2 ounces. A sanitary pad or tampon, depending on the type, can hold u...

A luteinizing hormone test measures how much luteinizing hormone a person has in their blood. This is a hormone with key roles in both male and female reproductive systems. Luteinizing hormone (LH) is involved in many bodily processes, including pregnancy, This article explores the uses of LH tests. It discusses high, low, and normal LH levels, as well as what they mean and how they relate to pregnancy. Share on Pinterest An LH test involves taking a blood sample. An LH test is a type of blood test that measures a person’s LH levels. LH is made in the pituitary gland of the brain. LH is a sex hormone that affects how a person’s reproductive organs work. In females, LH affects the ovaries. In males, it affects the testes. Reproductive health problems can affect a person’s LH levels. LH is involved in the following bodily processes: • Puberty: LH levels affect the onset of puberty. High LH levels may cause early puberty and low LH levels may delay puberty. • Menstruation: LH works with another sex hormone called follicle-stimulating hormone (FSH) to control menstrual cycles. • Ovulation: An increase in LH, called an LH surge, triggers the release of an egg from an ovary. • Progesterone release: An increase in LH triggers ovulation. The cell structure that is left after ovulation releases • Testosterone production: LH binds to Leydig cells in the testes and triggers • Sperm production: Testosterone, which LH levels affect, is needed for sperm production. We explore the variou...

In males, luteinising hormone (LH) stimulates the synthesis and secretion of hormones called androgens from testis. Androgens along with FSH (Follicle Stimulating Hormone) regulate spermatogenesis. In females, LH induces ovulation of fully mature follicles (Graafian follicles) and maintains the corpus luteum, formed from the remnants of the Graafian follicles after ovulation which secretes progesterone. Q. Testosterone is a steroid hormone produced by all vertebrate animals and, in humans and other mammals, it is secreted in large amounts by the testes of males and to a much lesser extent, the ovaries of females. In adult males, testosterone plays a key role in the development of reproductive organs and it promotes the secondary sexual characteristics of body and facial hair, increased muscle and bone mass, and a deep voice. Testosterone, like all hormones, works via long distance signaling and is regulated by other hormones as illustrated below: Figure 1: Testosterone regulation by cooperation between the hypothalamus, pituitary, and testicular endocrine glands. The major regulatory hormones involved are luteinizing hormone (LH), follicle-stimulating hormone (FSH) and gonadotropin-releasing hormone (GnRH). When testosterone levels are low, gonadotropin-releasing hormone (GnRH) is released by the hypothalamus, which in turn stimulates the pituitary gland to release FSH and LH. FSH and LH then stimulate the testis to produce testosterone. How is homeostasis achieved when te...