PTTH-Secreting Cells in Manduca Sexta Brain
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Questions and Answers

What hormone is released by yellow neurons in the hypothalamus?

  • Corticotropin-releasing hormone (CRH) (correct)
  • Adrenocorticotropic hormone (ACTH)
  • Vasopressin
  • Melanocyte-stimulating hormone

    • What is the function of prothoracicotropic hormone (PTTH) in insect metamorphosis control?

  • Stimulate melanocyte migration
  • Induce cortisol release
  • Promote vasopressin production
  • Regulate ecdysone secretion (correct)

    • Which hormone is responsible for the migration of pigment in fish melanophores?

  • ACTH
  • Adrenaline (correct)
  • Vasopressin
  • Melanocyte-stimulating hormone

    • In what sequence does the Hypothalamus-pituitary-adrenal cortex axis (HPA axis) act?

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

    What is the role of corticotropin-releasing hormone (CRH) in the circadian clock?

    <p>Affect physiological sense of time</p> Signup and view all the answers

    What is the function of PTTH in insect metamorphosis?

    <p>Determines whether an insect develops into a juvenile or an adult</p> Signup and view all the answers

    What is the purpose of the arthropod cuticle mentioned in the text?

    <p>Serving as a skeleton for muscle attachment</p> Signup and view all the answers

    Where are PTTH-secreting cells located in the brain of Manduca sexta?

    <p>In the midline of the brain</p> Signup and view all the answers

    Which hormone promotes cuticle degradation and synthesis in insects?

    <p>20E</p> Signup and view all the answers

    Which layer of the exoskeleton is secreted after molting?

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

    What is the main function of ecdysis in arthropods?

    <p>To enable growth in size</p> Signup and view all the answers

    Where does JH get released into to trigger cell/organism growth?

    <p>Blood directly</p> Signup and view all the answers

    What occurs during the premolt period of ecdysis?

    <p>The underlying epidermis starts to grow and form new cuticle</p> Signup and view all the answers

    Which hormone is responsible for initiating the process of ecdysis in insects?

    <p>Prothoracicotropic hormone (PTTH)</p> Signup and view all the answers

    What is the role of PTTH and JH together in insect development?

    <p>Create larger juveniles</p> Signup and view all the answers

    What happens during postmolt period in insects?

    <p>The animal seeks seclusion</p> Signup and view all the answers

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