Biology, Eighth Edition (Raven)

Chapter 46: The Endocrine System

Post Test

1
Paracrines: (p .920)
A)are just an alternative name for hormones.
B)travel through the blood.
C)are secreted by the parathyroid gland.
D)act within an organ as local regulators.
E)are neurohormones.
2
What is NOT true of the action of hydrophilic hormones? (p. 927)
A)They can act through intermediary G proteins.
B)A second messenger (e.g. cAMP) is often involved.
C)They can work by activation of transmembrane receptor proteins.
D)They stimulate an immediate response.
E)They have a long duration of action (e.g. days).
3
What is the proximate cause of a goiter? (p. 931)
A)lack of iodine in the diet
B)a non-functional thyroid gland
C)elevated levels of thyroid stimulating hormone
D)depressed levels of thyroid stimulating hormone
E)both a and c
4
The hormones insulin and glucagon are produced by different cells in the pancreas and have antagonistic effects. Insulin promotes the cellular uptake of glucose into liver, muscle and fat cells. What occurs when blood glucose levels decrease? (p. 938)
A)There is decreased insulin and glucagon production.
B)There is increased glucagon production.
C)Glycogen is hydrolyzed by the liver and glucose is released into the blood.
D)There is increased insulin production.
E)both b and c
5
You are rearing some plant bugs in the lab and they go through regular molts but never become sexually mature and remain in the nymphs. What could be the cause of this? (p. 940)
A)incorrect rearing temperature
B)a juvenile hormone analogue in the food
C)an ecdysone analogue in the food
D)incorrect photoperiod affecting melatonin production
E)none of the above
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