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Regulation of Hormone Secretion01:19

Regulation of Hormone Secretion

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Regulation of hormone secretion is a finely tuned orchestration driven by various types of stimuli, encompassing neural, humoral, and hormonal signals. Environmental cues instigate neural stimuli, where action potentials traverse nerve fibers to reach their designated targets. An illustrative scenario is the body's response to stress, wherein the sympathetic nervous system releases epinephrine from the adrenal glands, inducing the well-known 'fight or flight' reaction.
Humoral...
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Hormonal Regulation01:40

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Hormones regulate a significant portion of digestion through activation of the neuroendocrine system. The neuroendocrine system of digestion contains many different hormones all with multiple functions that are both, directly and indirectly, involved in digestion.
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Overview of Secretory Vesicles01:33

Overview of Secretory Vesicles

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Secretory vesicles, also known as dense core vesicles (DCVs), are membrane-bound vesicles that transport secretory proteins, such as hormones or neurotransmitters. Regulated secretory vesicles transport proteins from the trans-Golgi network to the exterior of the cell. Proteins present in regulated secretory vesicles are required to be rapidly exocytosed in large amounts upon a specific stimulus.
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Insulin Secretory Vesicles01:05

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Insulin secretory vesicles release insulin to stimulate blood glucose uptake and regulate carbohydrate metabolism. When the blood glucose levels increase, glucose enters the pancreatic β-islet cells through glucose transporters. Once inside, glucose is metabolized through glycolysis, the citric acid cycle, and the electron transport chain, producing ATP. This increase in ATP concentration closes ATP-sensitive potassium channels, leading to depolarization of the membrane and the opening of...
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The pancreatic islets comprising only 1%-2% of the volume are highly vascularized and innervated mini-organs. They contain five endocrine cell types, including β cells that secrete insulin, which is synthesized as a single polypeptide chain, preproinsulin, processed to proinsulin, and finally to insulin and C-peptide. This process is complex and regulated, involving the Golgi complex, the endoplasmic reticulum, and the secretory granules of the β cell.
Insulin and C-peptide are...
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Feedback Inhibition

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Biochemical reactions are occurring constantly in cells, converting starting substances to different products, usually with the help of enzymes that speed the reactions. Without enzymes, it would take far too long for most reactions to occur to be useful to the cell!
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関連する実験動画

Updated: Jan 9, 2026

Regulation of Hormone Secretion
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心房細動のスクリーニング:米国の予防サービスタスクフォースの勧告声明

, Karina W Davidson1, Michael J Barry2

  • 1Feinstein Institutes for Medical Research at Northwell Health, Manhasset, New York.

JAMA
|January 25, 2022
PubMed
まとめ

症状のない高齢者における心房細動 (AF) のスクリーニングは,十分な証拠がないため推奨されません. 米国予防サービスタスクフォースは,AFスクリーニングの利益と害は現在未定であると発見しました.

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Hormonal Regulation of Digestion
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関連する実験動画

Last Updated: Jan 9, 2026

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01:19

Regulation of Hormone Secretion

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Hormonal Regulation of Digestion
01:40

Hormonal Regulation of Digestion

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Overview of Secretory Vesicles
01:33

Overview of Secretory Vesicles

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科学分野:

  • 心臓病と予防医学

背景:

  • 心房細動 (AF) は最も一般的な心律動乱であり,年齢とともに増加し,不全性脳卒中のリスクが大きい.
  • AFに関連した脳卒中の約20%はAFの初期診断につながります.
  • AFの罹患率は年齢と性別によって異なりますが,人種や民族間の違いは不明です.

研究 の 目的:

  • 2018年の勧告を更新するために,USPSTFは高齢者のAFスクリーニングの利益と害を体系的に検討した.
  • このレビューでは,スクリーニングテストの正確性,未診断のAFの検出の有効性,およびスクリーニングで検出された症例に対する抗凝固薬の効果が評価されました.

主な方法:

  • 米国予防サービスタスクフォース (USPSTF) が委託した体系的なレビュー.
  • 50歳以上の無症状の成人に焦点を当てて,過去の一時性性不血症発作や脳卒中はなかった.
  • 評価されたスクリーニングテスト,検出の有効性,治療の効果/有害性

主要な成果:

  • 症状のない成人の心房細動のスクリーニングの利益と害に関する証拠は不足しています.
  • この集団におけるAFスクリーニングの利益と害のバランスを決定することができなかった.

結論:

  • USPSTFは,現在のエビデンスはAFのスクリーニングの利益と害のバランスを評価するのに不十分であると結論付けました.
  • "I"の声明が発行され,スクリーニングの賛成または反対の証拠が不十分であることを示しました.