Principles of Human Physiology (6th Edition)
Principles of Human Physiology (6th Edition)
6th Edition
ISBN: 9780134169804
Author: Cindy L. Stanfield
Publisher: PEARSON
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Chapter 6, Problem 1E
Summary Introduction

Introduction:

Adrenal gland comprises of adrenal cortex and the adrenal medulla. These secrete hormones which have different functionalities. Adrenal cortex is made of epithelial cells and adrenal medulla is made of neural cells. Zona glomerulosa, Zona fasciculate and zona reticularis are the three layers of adrenal cortex.

The cortex part of the adrenal gland is responsible for secretion of mineralocorticoids, glucocorticoids, and sex hormones. It secretes mineralocorticoids and glucocorticoids which helps regulate stress response. Adrenal medulla secretes two hormones i.e. adrenaline (epinephrine) and nor-adrenaline (nor-epinephrine). Known as adrenaline, Epinephrine is an active sympathomimetic hormone which stimulates the beta- and alpha-adrenergic systems.

Expert Solution & Answer
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Answer to Problem 1E

Solution:

Among the options given, the correct answer is option (d) medulla

Explanation of Solution

Explanation/justification for the correct answer:

The correct answer is option (d) Medulla. Zona glomerulosa, Zona fasciculate and zona reticularis are the three layers of adrenal cortex. Androgens, cortisol and aldosterone hormones are secreted by this. Another part of the adrenal gland which is made of neural cells is the adrenal medulla. This secretes hormones like epinephrine and nor-epinephrine. So, the option d. Medulla is correct answer.

Explanation for incorrect answer:

Option (a) Zona Reticularis. This is a layer of the adrenal cortex. The cortex part of the adrenal gland is responsible for secretion of stress response regulating hormones and sex hormones. Zona reticularis is the layer where Androgens are produced. Hence, it is incorrect.

Option (b) Zona fasciculate. This is a layer of the adrenal cortex. The cortex part of the adrenal gland is responsible for secretion of stress response regulating hormones and sex hormones. Zona fasciculate is the layer where glucocorticoids like cortisol are produced. Hence, it is incorrect.

Option (c) Zona glomerulosa. This is a layer of the adrenal cortex. The cortex part of the adrenal gland is responsible for the secretion of stress response regulating hormones and sex hormones. Zona glomerulosa is the layer where aldosterone is mainly produced. Hence, it is incorrect.

Conclusion

It is from the medulla that Epinephrine is released.

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