16 Questions
What hormone is released by yellow neurons in the hypothalamus?
Corticotropin-releasing hormone (CRH)
What is the function of prothoracicotropic hormone (PTTH) in insect metamorphosis control?
Regulate ecdysone secretion
Which hormone is responsible for the migration of pigment in fish melanophores?
Adrenaline
In what sequence does the Hypothalamus-pituitary-adrenal cortex axis (HPA axis) act?
Hypothalamus-Pituitary-Adrenal cortex
What is the role of corticotropin-releasing hormone (CRH) in the circadian clock?
Affect physiological sense of time
What is the function of PTTH in insect metamorphosis?
Determines whether an insect develops into a juvenile or an adult
What is the purpose of the arthropod cuticle mentioned in the text?
Serving as a skeleton for muscle attachment
Where are PTTH-secreting cells located in the brain of Manduca sexta?
In the midline of the brain
Which hormone promotes cuticle degradation and synthesis in insects?
20E
Which layer of the exoskeleton is secreted after molting?
Endocuticle
What is the main function of ecdysis in arthropods?
To enable growth in size
Where does JH get released into to trigger cell/organism growth?
Blood directly
What occurs during the premolt period of ecdysis?
The underlying epidermis starts to grow and form new cuticle
Which hormone is responsible for initiating the process of ecdysis in insects?
Prothoracicotropic hormone (PTTH)
What is the role of PTTH and JH together in insect development?
Create larger juveniles
What happens during postmolt period in insects?
The animal seeks seclusion
Test your knowledge on the PTTH-secreting neurosecretory cells in the brain of the moth Manduca sexta. Identify the characteristics and functions of these cells, including their staining, axon pathways, and terminal formations.
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