Endocrine System

1.    Which structures are NOT endocrine organs?

Corpora cardiaca

Prothoracic glands

Salivary glands

Ventral ganglia

 

2.   Which hormone is produced by neurosecretory cells in the brain?

Prothoracicotropic hormone

Ecdysone

Eclosion hormone

Juvenile hormone

 

3.   Which structures produce ecdysteroids?

Corpora allata

Corpora cardiaca

Prothoracic glands

Ventral ganglia

 

4.   What is the "target organ" (site of action) for the ecdysteroids?

Brain

Prothoacic glands

Corpora cardiaca

Epidermis

 

5.   Which hormone stimulates release of PTTH from the corpora cardiaca?

Brain hormone

Eclosion hormone

Bursicon

Juvenile hormone

 

6.   During a molt, what is the correct sequence of hormones that appear in the blood?

Eclosion hormone, PTTH, Bursicon, Ecdysteroids

PTTH, Ecdysteroids, Eclosion hormone, Bursicon

Ecdysteroids, Eclosion hormone, PTTH, Bursicon

PTTH, Ecdysteroids, Bursicon, Eclosion Hormone

 

7.   In larval insects, which hormone inhibits the development of imaginal discs?

Juvenile hormone

Brain hormone

Eclosion hormone

Ecdysteroids

 

8.   If you were to carefully remove the prothoracic glands from a larva, you would expect it to:

Molt into another larval instar

Pupate and then emerge as a sterile adult

Pupate and then emerge as a normal adult

Never molt again

 

9.   Which hormone would have a high titer (concentration) in the larva and the adult, but a lower titer in the pupa?

Brain hormone

Juvenile hormone

Eclosion hormone

Ecdysteroids

 

10.   If the corpora allata are removed from an adult female insect immediately after she emerges from the pupal stage, she will:

Become another pupa

Become a larva

Become reproductively sterile

Molt once more as an adult