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 (C)</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 (B)</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 (C)</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 (C)</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 (D)</p> Signup and view all the answers

Which hormone promotes cuticle degradation and synthesis in insects?

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

Which layer of the exoskeleton is secreted after molting?

<p>Endocuticle (D)</p> Signup and view all the answers

What is the main function of ecdysis in arthropods?

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

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

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

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

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

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

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

What happens during postmolt period in insects?

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

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