Ch. 20 Mechanisms of Hormone Regulation

Question 1

Which of the following is NOT a characteristic of a hormone?
Hormones have specific rates and rhythms of secretion.
Hormones operate independent of feedback systems.
Hormones affect only cells with appropriate receptors.
Kidneys excrete hormones.

Answer 1

Hormones operate independent of feedback systems

Question 2

Which of the following is TRUE regarding thyroid hormone and thyroid-stimulating hormone (TSH)?
Decreased anterior pituitary release of TSH stimulates its secretion.
TSH is secreted in excess when stimulated by T4.
TSH secretion is regulated by thyrotropin-releasing hormone.
TSH secretion is controlled by positive feedback.

Answer 2

TSH secretion is regulated by thyrotropin-releasing hormone.

Question 3

Which of the following is NOT one of the three responses of hormones when they interact with the receptor?
Acting on preexisting channel-forming proteins to alter membrane permeability
Activating preexisting proteins through a second-messenger system
Activating genes to cause protein synthesis
Acting on genes for DNA replication

Answer 3

Acting on genes for DNA replication

Question 4

Which of the following terms means “obvious changes in cell function that result from stimulation by a particular hormone”?
  Up-regulation
  Down-regulation
  Direct effects
  Permissive effects

Answer 4

Direct effects

Question 5

Which of the following is NOT a second messenger?
  DAG
  cAMP
  Norepinephrine
  IP3

Answer 5

Norepinephrine

Question 6

Which of the following is a TRUE statement regarding the hypothalamus?
It is divided into two nuclei.
It is connected to the anterior pituitary by a single membrane.
It is connected to the posterior pituitary by blood vessels.
The pituitary gland is located in the sella turcica.

Answer 6

The pituitary gland is located in the sella turcica.

Question 7

Which of the following is NOT part of the posterior pituitary?
  Median eminence
  Stalk
  Pars distalis
  Infundibular process

Answer 7

Pars distalis

Question 8

Which of the following is secreted by the posterior pituitary?
  Oxytocin
  Calcitonin
  Thyroid-stimulating hormone (TSH)
  Parathyroid hormone

Answer 8

Oxytocin

Question 9

Which of the following hormones is secreted by the anterior pituitary?
  Androgen
  Prolactin
  Thyroid
  Oxytocin

Answer 9

Prolactin

Question 10

Which of the following is NOT found in the thyroid gland?
  C cells
  Follicles
  Isthmus
  Chromophils

Answer 10

Chromophils

Question 11

Which of the following is a TRUE statement regarding the parathyroid gland(s)?
There are at least 6 to 10 pairs of glands.
They are large and make up the majority of the thyroid gland.
They produce thyroid hormone.
Parathyroid hormone (PTH) is the most important factor in Ca++ regulation.

Answer 11

Parathyroid hormone (PTH is the most important factor in Ca++ regulation

Question 12

Which of the following is NOT one of the three types of hormone-secreting cells in the pancreas?
  Alpha
  Beta
  F
  Delta

Answer 12

F

Question 13

A person is diagnosed with diabetes and is unable to produce insulin. Which of the following cells in the pancreas are most likely damaged in this person?
  Beta
  Alpha
  C peptide
  Delta

Answer 13

Beta

Question 14

A person has hyperglycemia (increased blood glucose). Which of the following is a TRUE statement regarding glucagon?
It is produced by beta cells.
Hyperglycemia will inhibit glucagon release.
Glucagon decreases blood glucose.
It inhibits lipolysis.

Answer 14

Hyperglycemia will inhibit glucagon release

Question 15

Which of the following is NOT an effect of glucocorticoids?
  Metabolic
  Hypertensive
  Anti-inflammatory
  Growth suppression

Answer 15

Hypertensive