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Related Concept Videos

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.
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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

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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 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.
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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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Related Experiment Video

Updated: Jan 9, 2026

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Postgraduate course presentation. Infantile bronchial asthma.

E Tabachnik, H Levison

    The Journal of Allergy and Clinical Immunology
    |May 1, 1981
    PubMed
    Summary

    Most childhood asthma patients do not outgrow their condition, with many relapsing in adulthood. Long-term prognosis indicates persistent bronchial hyperreactivity even in symptom-free individuals.

    Area of Science:

    • Pediatric Pulmonology
    • Allergy and Immunology
    • Clinical Epidemiology

    Background:

    • Childhood asthma prognosis is often considered optimistic, with many believing children
    • outgrow
    • the condition.
    • Therapeutic interventions, including hyposensitization therapy, lack evidence of directly impacting long-term asthma outcomes.
    • Previous estimates of childhood asthma resolution require reevaluation based on recent longitudinal data.

    Purpose of the Study:

    • To critically assess the long-term prognosis of childhood asthma.
    • To evaluate the persistence of asthma symptoms and bronchial hyperreactivity into adulthood.
    • To challenge the common notion that childhood asthma is typically outgrown.

    Main Methods:

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    Last Updated: Jan 9, 2026

    Regulation of Hormone Secretion
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    Overview of Secretory Vesicles
    01:33

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    • Review of existing literature on childhood asthma prognosis.
    • Analysis of longitudinal follow-up data, including a 20-year study of 267 childhood asthmatics.
    • Assessment of symptom resolution and bronchial hyperreactivity in adult outcomes.

    Main Results:

    • Long-term prognosis for childhood asthma is less optimistic than previously assumed.
    • Approximately 30% of adolescents who are symptom-free relapse into symptomatic early adulthood.
    • Only 50% of childhood asthmatics achieve near or complete symptom freedom by adulthood, with 60% retaining bronchial hyperreactivity.

    Conclusions:

    • The belief that most children
    • outgrow
    • asthma is inaccurate.
    • Childhood asthma frequently persists into adulthood, often with underlying bronchial hyperreactivity.
    • Further research is needed to understand the chronic nature of asthma and improve long-term management strategies.