Chapter 45- Endocrine System

Question 1

Which of the following is not an accurate statement?
A. Hormones are chemical messengers that travel to target cells through the circulatory system.
B. Hormones often regulate homeostasis through antagonistic functions.
C. Hormones of the same chemical class usually have the same function.
D. Hormones are often regulated through feedback loops.

Answer 1

C. Hormones of the same chemical class usually have the same function.

Question 2

The hypothalamus
A. Synthesizes all of the hormones produced by the pituitary gland.
B. Influences the function of only one lobe of the pituitary gland.
C. Produces only inhibitory hormones.
D. Regulate both reproductive and body temperature.

Answer 2

D. Regulates both reproductive and body temperature.

Question 3

Growth factors are local regulators that
A. Are produced by the anterior pituitary.
B. Are modified fatty acids that stimulate bone and cartilage growth.
C. Are found on the surface of cancer cells and stimulate abnormal cell division.
D. Bind to cell-surface receptors and stimulate growth and development of target cells.

Answer 3

D. Bind to cell-surface receptors and stimulate growth and development of target cells.

Question 4

Which hormone is incorrectly paired with its action?
A. Oxytocin- stimulates uterine contractions during childbirth
B. Thyroxine- inhibits metabolic processes
C. ACTH- stimulates the release of glucocorticoids by the adrenal cortex.
D. Melatonin- affects biological rhythms and seasonal reproduction.

Answer 4

B. Thyroxine- inhibits metabolic processes

Question 5

Steroid and peptide hormones typically have in common
A. Their solubility in cell membranes.
B. Their requirement for travel through the bloodstream.
C. The location of their receptors.
D. Their reliance on signal transduction in the cell

Answer 5

B. Their requirement for travel through the bloodstream.

Question 6

Which of the following is the most likely explanation for hypothyroidism in a patient whose iodine level is normal?
A. Greater production of T3 than of T4
B. Hyposecretion of TSH
C. Hypersecretion of MSH
D. A decrease in the thyroid secretion of calcitonin

Answer 6

B. Hyposecretion of TSH

Question 7

Steroid and peptide hormones typically have in common
A. Their solubility in cell membranes.
B. Their requirement for travel through the bloodstream.
C. The location of their receptors.
D. Their reliance on signal transduction in the cell

Answer 7

B. Their requirement for travel through the bloodstream.

Question 8

Which of the following is the most likely explanation for hypothyroidism in a patient whose iodine level is normal?
A. Greater production of T3 than of T4
B. Hyposecretion of TSH
C. Hypersecretion of MSH
D. A decrease in the thyroid secretion of calcitonin

Answer 8

B. Hyposecretion of TSH