Paracrine Hormone General Overview
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Paracrine Hormone General Overview

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Questions and Answers

Which substances are classified as autacoids?

  • Adrenaline and acetylcholine
  • Endogenous peptides and cytokines
  • Angiotensin and homones
  • Histamine and serotonin (correct)

    • What is a common characteristic of autacoids when they are released?

  • They have immediate effects on all cells
  • They affect distant cells
  • They only affect the surrounding cells (correct)
  • They remain inactive

    • What do autacoids and endogenous peptides, prostaglandins, leukotrienes, and cytokines constitute?

  • Neurotransmitters
  • Local hormones
  • Hormones
  • Drugs (correct)

    • What is the role of histamine and serotonin in the body?

    <p>Neurotransmitter function</p> Signup and view all the answers

    What was discovered about tissues containing substances that release physiologic effects?

    <p>Some are also present in nervous tissue with multiple functions</p> Signup and view all the answers

    Which of the following substances are not carried by blood to produce effects in other organs?

    <p>Histamine and serotonin</p> Signup and view all the answers

    What is the reason why histamine and serotonin do not have any clinical application in disease treatment?

    <p>Undesirable peripheral effects</p> Signup and view all the answers

    Which type of communication involves autacoids acting locally on the cell from which they are released?

    <p>Autocrine communication</p> Signup and view all the answers

    Which substances act like hormones, entering circulation and affecting distant organs?

    <p>Prostaglandins</p> Signup and view all the answers

    What role do neurotransmitters play in neural tissues?

    <p>They carry messages across neural junctions</p> Signup and view all the answers

    What is the main function of APUD cells described in the text?

    <p>Uptake of amino acids to produce amines</p> Signup and view all the answers

    How can the complicated functions of some substances being a transmitter, hormone, and autocoid at the same time be explained?

    <p>By the characteristics of APUD cells</p> Signup and view all the answers

    What actions do intestinal hormones have in the gastrointestinal system according to the text?

    <p>Affecting motility, exocrine secretion, digestion, and absorption</p> Signup and view all the answers

    What type of molecules are most of the intestinal hormones mentioned in the text?

    <p>Polypeptides</p> Signup and view all the answers

    Which of the following is NOT listed as an intestinal hormone in the text?

    <p>Insulin</p> Signup and view all the answers

    What is a characteristic of APUD cells mentioned in the text?

    <p>They act both locally like autocoids and like hormones in circulation</p> Signup and view all the answers

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