Hypothalamic Regulation of Hormonal Function
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Questions and Answers

What does an elevated TSH suggest?

  • Normal ability of circulating thyroid hormone to suppress TSH synthesis
  • Loss of the ability of the thyroid gland to synthesize hormone (correct)
  • Effective suppression of TSH synthesis
  • Increased ability of the thyroid gland to synthesize hormone
  • Which nuclei give rise to axons that pass to the posterior pituitary via the hypothalamohypophysial tract?

  • Cerebellar nuclei
  • Medulla oblongata
  • Supraoptic and paraventricular nuclei (correct)
  • Red nucleus
  • Which part of the brain integrates autonomic mechanisms for maintaining internal chemical constancy and temperature?

  • Hippocampus
  • Frontal lobe
  • Cerebellum
  • Hypothalamus (correct)
  • What is the embryological origin of the posterior pituitary gland?

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

    What is the main function of the hypothalamus with regard to emotional and instinctual behavior?

    <p>Regulation of hormonal functions</p> Signup and view all the answers

    Which lobe of the pituitary gland receives neural connections from the hypothalamus?

    <p>Posterior lobe</p> Signup and view all the answers

    What does the text suggest is the function of positive feedback loops in the endocrine system?

    <p>To enhance the original release mechanism</p> Signup and view all the answers

    Which organ is primarily affected when a negative feedback loop leads to dampening of the hormone release mechanism?

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

    Which type of feedback loop involves the enhancement or continued stimulation of the original release mechanism?

    <p>Positive feedback loop</p> Signup and view all the answers

    What diagnostic strategy is mentioned in the text with regards to evaluating patients suspected of endocrine disorders?

    <p>Evaluating TSH levels</p> Signup and view all the answers

    In what setting are positive feedback mechanisms typically observed?

    <p>Settings that need momentum for an eventual outcome</p> Signup and view all the answers

    What is the physiologic role of β-lipotropin (β-LPH) that is secreted with ACTH?

    <p>Promotes fat breakdown</p> Signup and view all the answers

    How is the responsiveness of target cells to hormonal action related to feedback control in the endocrine system?

    <p>Target cell responsiveness feeds back to control hormone release</p> Signup and view all the answers

    What are the six established hypothalamic releasing and inhibiting hormones?

    <p>Corticotropin-releasing hormone, thyrotropin-releasing hormone, growth hormone–releasing hormone, growth hormone–inhibiting hormone, luteinizing hormone–releasing hormone, prolactin-inhibiting hormone</p> Signup and view all the answers

    Where are hypophysiotropic hormones commonly secreted into?

    <p>Portal hypophysial vessels</p> Signup and view all the answers

    Which type of blood has the highest concentration of hypophysiotropic hormones?

    <p>Portal hypophysial blood</p> Signup and view all the answers

    Which term is now generally used to refer to what were previously known as growth hormone–inhibiting hormones?

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

    What is the nature of the control of anterior pituitary secretion from the hypothalamus to the pituitary?

    <p>Chemical control via portal hypophysial vessels</p> Signup and view all the answers

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