luteinizing hormone

(noun)

a hormone, produced by part of the pituitary gland, that stimulates ovulation and the development of the corpus luteum in female mammals, and the production of androgens by male mammals

Related Terms

  • androgen
  • testosterone
  • follicle stimulating hormone
  • gonad
  • gonadotropin-releasing hormone
  • Leydig cell
  • prolactin
  • inhibin
  • Sertoli cell
  • puberty

Examples of luteinizing hormone in the following topics:

  • Hormonal Regulation of the Male Reproductive System

    • Hormonal control of spermatogenesis varies among species.
    • They are capable of producing the hormones estradiol and inhibin.
    • ThereĀ it stimulates the synthesis and secretion of the gonadotropins, FSH and luteinizing hormone (LH).
    • Follicle Stimulating Hormone is released by the anterior pituitary gland.
    • Luteinizing Hormone is released by the anterior pituitary gland.
  • Onset, Duration, and Half-Life of Hormone Activity

    • Hormone half-life and duration of activity are limited and vary from hormone to hormone.
    • Hormone half-life and duration of activity are limited and vary from hormone to hormone.
    • Duration of hormone activity refers to the duration of events which were stimulated by hormone-receptor binding.
    • Follicle-Stimulating Hormone 2.
    • Luteinizing Hormone 4.
  • Hormonal Regulation of the Female Reproductive Cycle

    • The menstrual cycle is controlled by a series of changes in hormone levels, primarily estrogen and progesterone.
    • Follicle-stimulating hormone (FSH) is secreted by the anterior pituitary gland.
    • Follicle-stimulating hormone induces the proliferation of granulosa cells in the developing follicles and the expression of luteinizing hormone (LH) receptors on these cells.
    • Luteinizing hormone induces androgen synthesis by theca cells, stimulates proliferation, differentiation, and increases LH receptor expression on granulosa cells.
    • The surge also initiates luteinization of theca and granulosa cells.
  • The Anterior Pituitary

    • Thyroid-stimulating hormone is a glycoprotein hormone that affects the thyroid gland and the secretion of thyroid hormones.
    • Follicle-stimulating hormone is a glycoprotein hormone that targets the gonads and effects the growth of the reproductive system.
    • Luteinizing hormone is a glycoprotein hormone that targets the gonads to effect sex hormone production.
    • Growth hormone is a polypeptide hormone that targets the liver and adipose tissue, which promotes growth through lipid and carbohydrate metabolism.
    • Hormone secretion from the anterior pituitary gland is regulated by hormones secreted by the hypothalamus.
  • Male Hormones

    • The onset of puberty is controlled by two major hormones: FSH initiates spermatogenesis and LH signals the release of testosterone.
    • These changes are largely influenced by hormonal activity.
    • Hormones play an organizational role, priming the body to behave in a certain way once puberty begins, and an activational role, referring to changes in hormones during adolescence that trigger behavioral and physical changes.
    • At the onset of puberty, the hypothalamus begins secreting high pulses of GnRH, or gonadotropin-releasing hormone.
    • In response, the pituitary gland releases follicle stimulating hormone (FSH) and luteinizing hormone (LH) into the male system for the first time.
  • Hypothalamic-Pituitary Axis

    • The anterior pituitary produces seven hormones: growth hormone (GH), prolactin (PRL), thyroid-stimulating hormone (TSH), melanin-stimulating hormone (MSH), adrenocorticotropic hormone (ACTH), follicle-stimulating hormone (FSH), and luteinizing hormone (LH).
    • Anterior pituitary hormones are sometimes referred to as tropic hormones because they control the functioning of other organs.
    • While these hormones are produced by the anterior pituitary, their production is controlled by regulatory hormones produced by the hypothalamus.
    • These regulatory hormones can be releasing hormones or inhibiting hormones, causing more or less of the anterior pituitary hormones to be secreted.
    • Negative feedback then regulates how much of these regulatory hormones are released and how much anterior pituitary hormone is secreted.
  • Hormonal Regulation of the Reproductive System

    • During puberty, in both males and females, the hypothalamus produces gonadotropin-releasing hormone (GnRH), which stimulates the production and release of follicle stimulating hormone (FSH) and luteinizing hormone (LH) from the anterior pituitary gland.
    • FSH production is inhibited by the hormone inhibin, which is released by the testes.
    • It is also called interstitial-cell-stimulating hormone.
    • Prolactin levels are regulated by the hypothalamic hormones, prolactin-releasing hormone (PRH) and prolactin-inhibiting hormone (PIH) (which is now known to be dopamine).
    • Hormonal regulation of the female reproductive system involves hormones from the hypothalamus, pituitary, and ovaries.
  • Hormonal Methods

    • Hormonal birth control contains steroid hormones that alter female fertility.
    • Altogether, 18% of the world's contraceptive users rely on hormonal methods.
    • Hormonal contraception is highly effective: when taken on the prescribed schedule, users of steroid hormone methods experience pregnancy rates of less than 1% per year.
    • The effect of hormonal agents on the reproductive system is complex.
    • Progesterone negative feedback decreases the frequency of gonadotropin-releasing hormone (GnRH) released by the hypothalamus, which decreases the release of follicle-stimulating hormone (FSH), and greatly decreases the release of luteinizing hormone (LH) by the anterior pituitary.
  • Female Hormones

    • The stages of the ovarian cycle in the female are regulated by hormones secreted by the hypothalamus, pituitary, and the ovaries.
    • As with the male, the hypothalamic hormone GnRH (gonadotropin-releasing hormone) causes the release of the hormones FSH (follicle stimulating hormone) and LH (luteinizing hormone) from the anterior pituitary.
    • Follicle cells produce the hormone inhibin, which inhibits FSH production.
    • Estradiol and progesterone are steroid hormones that prepare the body for pregnancy.
    • Rising and falling hormone levels result in progression of the ovarian and menstrual cycles.
  • Ovarian Cycle

    • The main hormone controlling this stage is estradiol.
    • During the follicular phase, follicle-stimulating hormone (FSH) is secreted by the anterior pituitary gland.
    • Follicle-stimulating hormone induces the proliferation of granulosa cells in the developing follicles, and the expression of luteinizing hormone (LH) receptors on these granulosa cells.
    • These falling levels of ovarian hormones cause increased levels of FSH, which begins recruiting follicles for the next cycle.
    • Because the hormone is unique to the embryo, most pregnancy tests look for the presence of hCG.
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