Chapter 21: Mechanisms of Hormonal Regulation

Chapter 21: Mechanisms of Hormonal Regulation

Complete Chapter Questions With Answers

Sample Questions Are Posted Below

MULTIPLE CHOICE

1. What imbalance lessens the rate of secretion of parathyroid hormone (PTH)?

ANS:  A

The overall effect of parathyroid hormone (PTH)is to increase serum calcium and to decrease serum phosphate concentration. The other presented imbalances will not affect PTH in the described fashion.

PTS:   1                    REF:   Pages 702-703

2. Regulation of the release of catecholamines from the adrenal medulla is an example of which type of regulation?

ANS:  C

The release of hormones occurs either in response to an alteration in the cellular environment or in the process of maintaining a regulated level of certain hormones or certain substances. Several different mechanisms, one of which is neural control (e.g., stress-induced release of catecholamines from the adrenal medulla), regulate the release of hormones. The remaining options do not accurately describe the example given.

PTS:   1                    REF:   Page 690

3. How does a faulty negative-feedback mechanism result in a hormonal imbalance?

ANS:  D

Negative-feedback systems are important in maintaining hormones within physiologic ranges. The lack of negative-feedback inhibition on hormonal release often results in pathologic conditions. Excessive hormone production, which is the result of the failure to turn off the system, can cause various hormonal imbalances and related conditions. The correct option is the only accurate description of this hormonal function.

PTS:   1                    REF:   Pages 690-691

4. Which substance is a water-soluble protein hormone?

ANS:  D

Peptide or protein hormones, such as insulin, pituitary, hypothalamic, and parathyroid, are water soluble and circulate in free (unbound) forms. All the remaining options are fat-soluble hormones.

PTS:   1                    REF:   Page 691