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Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

Researchers measured prolactin and growth hormone in the blood plasma of six subjects at regular intervals over a 24-hour period. The investigators were interested in determining if the levels of these two hormones cycle over a 24-hour period. The Figure presents the results of their experiments, with the y axis values showing the amount of each hormone expressed as a percentage of the 24-hour mean value, and each point showing the average of the six subjects’ levels.

Chapter 42, Problem 3ITD, Researchers measured prolactin and growth hormone in the blood plasma of six subjects at regular

FIGURE Mean concentrations of prolactin and growth hormone in plasma, averaged for six subjects and expressed as a percentage of the average concentrations measured for the 24-hour period.

Is there any consistent relationship between the patterns of prolactin and growth hormone in the plasma in the 24-hour period?

Source: From J. F. Sassin et al. 1972. Human prolactin: 24-hour pattern with increased release during sleep. Science 177:1205–1207.

Summary Introduction

To review:

Whether there is any consistent relationship between the patterns of prolactin and growth hormone in plasma in the 24-hour period.

Introduction:

Lactation is the process of secretion of the milk from mammary glands. There are different hormones that influence this secretion, namely, the human placental lactogen, estrogen, prolactin, progesterone, oxytocin, follicle stimulating hormone, luteinizing hormone, human chorionic gonadotropin, growth hormone, and adrenocorticotropic hormone. The growth hormone also regulates cell regeneration and cell reproduction.

Explanation

The maximum amount of prolactin is secreted during 11:30 p.m. to 8’O clock in the morning whereas the minimal amount of prolactin is secreted during 2 to 4’O clock in the day. In the daytime, after 12’O clock, the levels of prolactin increases and subsequently decreases after each hour. The maximum growth hormone is secreted between the time period of 1 a.m. to 5 a.m. The level of hormone remains minimal after 2’O clock in the day till 11’O clock in the night. After 12’O clock, the secretion of growth hormone increases and subsequently decreases after each hour...

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