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Synthesis and Functions of Calcitonin00:51

Synthesis and Functions of Calcitonin

Calcitonin, a vital polypeptide hormone, regulates calcium levels within body fluids. It is released by the parafollicular cells, also known as C cells, situated in the follicular epithelium of the thyroid gland. Calcitonin responds to fluctuations in blood calcium levels and the influence of gastrointestinal hormones like gastrin and cholecystokinin.
The exact mechanisms by which calcitonin operates in calcium homeostasis remain elusive, but its significance is evident in several vital...
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Short-term regulation of food intake primarily involves neural signals from the gastrointestinal (GI) tract, blood nutrient levels, and GI tract hormones. Communication between the gut and brain via vagal nerve fibers plays a significant role in evaluating the contents of the gut. Clinical studies have shown that protein ingestion produces a more prolonged response in these nerve fibers compared to an equivalent amount of glucose. Additionally, the activation of stretch receptors caused by GI...
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Major Hormones and Their Functions

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The renin-aldosterone system is an endocrine system which guides the renal absorption of water and electrolytes, thus managing blood pressure and osmoregulation. Activation of the system begins in the kidneys with a small cluster of cells adjacent to the afferent and efferent blood vessels of the renal corpuscle. As the nephrons are filtering blood, juxtaglomerular cells monitor blood pressure. If they detect a decrease in pressure, they release the hormone renin into the bloodstream.
Thermoregulation01:26

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The human body has a sophisticated thermoregulation system that employs negative feedback mechanisms to maintain an optimal core temperature. When the core temperature drops, peripheral and central thermoreceptors send signals to the hypothalamus, activating the heat-promoting center. This center triggers several responses aimed at increasing the core temperature. First, vasoconstriction reduces the flow of warm blood from internal organs to the skin so that the heat is not lost from the skin,...

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Assessment of the Metabolic Effects of Isocaloric 2:1 Intermittent Fasting in Mice
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Caloric restriction: impact upon pituitary function and reproduction.

Bronwen Martin1, Erin Golden, Olga D Carlson

  • 1Laboratory of Neurosciences, National Institute on Aging Intramural Research Program, 5600 Nathan Shock Drive, Baltimore, MD 21224, USA. martinbro@grc.nia.nih.gov

Ageing Research Reviews
|March 11, 2008
PubMed
Summary
This summary is machine-generated.

Caloric restriction (CR) extends lifespan and improves health by impacting the neuroendocrine system. This review explores how CR affects reproductive health and hormone regulation, offering insights into managing reproductive dysfunction.

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Area of Science:

  • Reproductive Endocrinology
  • Neuroendocrinology
  • Aging Biology

Background:

  • Caloric restriction (CR) is a dietary intervention known to extend lifespan and healthspan across various species.
  • CR influences key physiological processes including oxidative stress, insulin sensitivity, and neuroendocrine function.
  • Reproductive health is critically dependent on energy balance, involving complex hormonal interactions.

Purpose of the Study:

  • To review the multifaceted effects of caloric restriction on reproductive health.
  • To examine the impact of CR on the anterior pituitary and reproductive axes in both sexes.
  • To elucidate the relationship between energy intake, reproductive function, and endocrine pulsatility.

Main Methods:

  • Literature review of studies investigating caloric restriction and reproductive physiology.
  • Analysis of hormonal regulation and neuroendocrine pathways affected by CR.
  • Synthesis of findings on male and female reproductive axis responses to reduced energy intake.

Main Results:

  • CR significantly impacts reproductive capacity by modulating hormonal signals from the periphery and central nervous system.
  • The anterior pituitary, a key endocrine gland, plays a central role in mediating CR's effects on reproduction.
  • CR influences the pulsatile release of reproductive hormones, affecting gonadotrope function.

Conclusions:

  • Understanding CR's influence on reproductive axes provides insights into energy balance and fecundity.
  • CR's effects on reproductive function offer potential strategies for managing reproductive disorders.
  • Further research into CR's endocrine mechanisms can inform novel therapeutic approaches for reproductive dysfunction.