Antidiuretic Hormone Effects and Angiotensin Peptides Quiz
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Questions and Answers

Which hormone is one of the most potent vasoconstrictor substances?

  • Angiotensin II (correct)
  • Adrenaline
  • Angiotensin III
  • Noradrenaline
  • What is the primary site of formation for vasopressin (ADH)?

  • Posterior pituitary gland
  • Anterior pituitary gland
  • Hypothalamus (correct)
  • Adrenal medulla
  • Which receptor opposes the pressor actions of the AT1 receptor?

  • α-adrenergic receptor
  • β-adrenergic receptor
  • AT2 receptor (correct)
  • Atrial B receptor
  • Which component constitutes 80% of the hormones produced by the adrenal medulla?

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

    When is vasopressin (ADH) released into circulation?

    <p>During dehydration</p> Signup and view all the answers

    Which hormone reduces urine formation by the kidney?

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

    What is the main physiological action of angiotensin II through AT1 receptors?

    <p>Direct pressor action via receptors on vascular smooth muscle</p> Signup and view all the answers

    Which hormone increases sodium and water reabsorption from the kidney?

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

    What is the enzyme responsible for converting angiotensin I to angiotensin II in the lungs?

    <p>ACE (angiotensin-converting enzyme)</p> Signup and view all the answers

    Which of the following is NOT a physiological action of angiotensin II through AT1 receptors?

    <p>Direct inhibition of aldosterone synthesis</p> Signup and view all the answers

    Which hormone is secreted by the kidney in response to low arterial pressure or reduced extracellular fluid volume?

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

    What is the main effect of aldosterone on the kidney?

    <p>Increases sodium and water reabsorption</p> Signup and view all the answers

    Which vasoconstrictor is responsible for causing hypotension and anaphylactic shock in severe conditions?

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

    Which endothelial vasoconstrictor contributes to inflammatory responses and increases the permeability of venules?

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

    Which molecule inactivates bradykinin in the body, decreasing its physiological half-life?

    <p>Angiotensin II</p> Signup and view all the answers

    Which neurotransmitter acts as a vasodilator, increasing capillary permeability and attracting leucocytes?

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

    Which vasoconstrictor is responsible for causing constriction of large arteries and veins?

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

    Which molecule plays a role in the local regulation of blood flow when released from argentaffin cells in the intestine?

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

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