2 SEM ACC W/RAVEN CARDED
2 SEM ACC W/RAVEN CARDED
12th Edition
ISBN: 9781264439218
Author: Raven
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 44, Problem 1DA
Summary Introduction

To explain: The way hypophysectomy on an early tadpole will affect the level of thyroxine hormone and metamorphosis.

Introduction: Hormones are chemicals messengers that are produced and circulated in the blood to regulate behavior, physiological, and metabolic activities. The pituitary is an endocrine gland that controls different functions. The removal of the pituitary by surgery is known as hypophysectomy.

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Explanation of Solution

A metamorphosis is an important event of tadpole life. Metamorphosis refers to the transformation of an immature form of a tadpole to its adult form. Hypophysectomy in early tadpole will disturb the entire signaling axis, thyroxine would not be secreted and metamorphosis would be blocked.

Summary Introduction

To explain: The way hypophysectomy on a late tadpole will affect the level of thyroxine hormone and metamorphosis.

Expert Solution
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Explanation of Solution

The pituitary gland secretes thyroid-stimulating hormone (TSH). TSH signaling is initiated in the early tadpole. This stimulates the thyroxine secretion that binds with the gene for expressing proteins for metamorphosis. If hypophysectomy is performed in late tadpole then it will not affect the metamorphosis or thyroxine level because in late tadpole pituitary hormone is not required.

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