Response Systems in the Body
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Questions and Answers

Where are peptide hormones derived from?

  • Proteins
  • Cholesterol (correct)
  • Carbohydrates
  • Lipids
  • What is the main source of steroid hormones?

  • Liver
  • Adrenal cortex (correct)
  • Pancreas
  • Thyroid gland
  • How are peptide hormones transported in the blood?

  • Free form (correct)
  • Attached to carbohydrates
  • Bound to lipids
  • Complexed with proteins
  • Which type of hormones have a relatively short half-life?

    <p>Peptide hormones</p> Signup and view all the answers

    What is the cellular mechanism of action for peptide hormones through receptor-enzymes?

    <p>Phosphorylation of cytoplasmic proteins</p> Signup and view all the answers

    What is the precursor form of peptide hormones that still remains inactive?

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

    What distinguishes hormones from other chemical signals used by cells?

    <p>They are secreted into the blood.</p> Signup and view all the answers

    Which system provides a rapid response but with short duration?

    <p>Nervous system</p> Signup and view all the answers

    What is the primary function of hormones in the body?

    <p>Regulating long-term functions</p> Signup and view all the answers

    How do hormone receptors contribute to cellular responses?

    <p>Initiate the response within target cells</p> Signup and view all the answers

    In endocrinology, how are hormones classified based on tissue source?

    <p>By tissue origin</p> Signup and view all the answers

    What is a common fate of circulating hormones in the body?

    <p>Degraded by liver or kidneys</p> Signup and view all the answers

    How are steroid hormones released into the blood?

    <p>Released through simple diffusion as needed</p> Signup and view all the answers

    What is the half-life of cortisol in the blood?

    <p>69-90 minutes</p> Signup and view all the answers

    Where do single tyrosine molecules give rise to catecholamines?

    <p>Adrenal cortex</p> Signup and view all the answers

    What is the cellular mechanism of action of steroid hormones?

    <p>Utilize nuclear receptors to produce genomic effects</p> Signup and view all the answers

    Which gland secretes melatonin?

    <p>Pineal gland</p> Signup and view all the answers

    What are the two neurohormones released by the posterior pituitary when stimulated?

    <p>Vasopressin (ADH) and oxytocin</p> Signup and view all the answers

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