Hormones and Receptors Quiz
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Questions and Answers

Which of the following is the most potent vasoconstrictor substance?

  • Noradrenaline
  • Antidiuretic hormone (correct)
  • Angiotensin II
  • Adrenaline

    • What is the primary function of Angiotensin II (Ang II) in the body?

  • To increase urine production
  • To stimulate the release of aldosterone (correct)
  • To induce thirst responses
  • To act as a vasodilator

    • What is the role of the AT2 receptor in the actions of Angiotensin II?

  • It has no clear role in the actions of Ang II
  • It mediates the pressor actions of Ang II
  • It stimulates the release of antidiuretic hormone
  • It opposes the pressor actions of the AT1 receptor (correct)

    • What is the primary stimulus for the release of antidiuretic hormone (ADH) from the posterior pituitary gland?

    <p>Increased blood osmotic pressure</p> Signup and view all the answers

    What is the primary effect of noradrenaline (norepinephrine) released from the adrenal medulla?

    <p>Increased heart rate and contractility</p> Signup and view all the answers

    What is the primary function of the related Angiotensin peptides (Ang III, Ang IV, Ang 1-7)?

    <p>Their functions are not yet clearly defined</p> Signup and view all the answers

    Which of the following is the primary physiological function of angiotensin II in the regulation of blood flow?

    <p>Activating the sympathetic nervous system to cause vasoconstriction</p> Signup and view all the answers

    Which of the following is the primary mechanism by which antidiuretic hormone (ADH) regulates blood flow?

    <p>Activating the sympathetic nervous system to cause vasoconstriction</p> Signup and view all the answers

    Which of the following is the primary role of the sympathetic nervous system in the regulation of blood flow?

    <p>Causing vasoconstriction through the release of norepinephrine and other vasoconstrictors</p> Signup and view all the answers

    What is the primary function of aldosterone in the regulation of blood flow?

    <p>Stimulating the reabsorption of sodium and water in the kidneys, leading to increased blood volume and pressure</p> Signup and view all the answers

    Which of the following is the primary mechanism by which atrial natriuretic peptide (ANP) regulates blood flow?

    <p>Inhibiting the reabsorption of sodium and water in the kidneys, leading to decreased blood volume and pressure</p> Signup and view all the answers

    Which of the following is the primary role of the renin-angiotensin-aldosterone system (RAAS) in the regulation of blood flow?

    <p>Stimulating the reabsorption of sodium and water in the kidneys, leading to increased blood volume and pressure</p> Signup and view all the answers

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

    <p>Direct vasodilatory effect on vascular smooth muscle</p> Signup and view all the answers

    Which enzyme is responsible for converting angiotensin I to the active form, angiotensin II?

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

    Which hormone is primarily responsible for stimulating aldosterone synthesis in the adrenal cortex?

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

    Which of the following statements about vasoconstrictors is NOT true?

    <p>Thromboxane A2 is a vasodilator promoted by angiotensin II</p> Signup and view all the answers

    Which of the following conditions can trigger the release of renin from the kidneys?

    <p>Decreased extracellular fluid (ECF) volume</p> Signup and view all the answers

    Which of the following statements about the sympathetic nervous system and angiotensin II is correct?

    <p>Angiotensin II potentiates sympathetic nervous system activity through AT1 receptors</p> Signup and view all the answers

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