Thyroid Hormones

Thyroid Hormones

Assessment

Interactive Video

Science, Biology, Chemistry

University

Hard

Created by

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The video explores the biosynthesis of thyroid hormones, focusing on T3 (triiodothyronine) and T4 (tetraiodothyronine). It explains the role of thyroglobulin and the iodination process, detailing the activation of iodide and the mechanism of iodination of tyrosine residues. The video also covers the radical mechanism involved in synthesizing T3 and T4, and discusses the function of thyroxine in regulating metabolic rate. Additionally, it touches on hypothyroidism and the use of levothyroxine as a treatment.

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10 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What do T3 and T4 stand for in the context of thyroid hormones?

Triiodothyronine and Tetrahydrothyronine

Triiodothyronine and Tetraiodine

Triiodothyronine and Tetraethylene

Triiodothyronine and Tetraiodothyronine

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the role of thyroglobulin in thyroid hormone biosynthesis?

It acts as a catalyst for hormone synthesis.

It provides the tyrosine residues for iodination.

It converts T4 to T3.

It transports hormones in the bloodstream.

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which enzyme is responsible for the iodination of tyrosine residues in thyroglobulin?

Iodine synthase

Thyroxine reductase

Thyroglobulinase

Thyroid peroxidase

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is hypoiodite in the context of thyroid hormone synthesis?

A monatomic iodine ion

An iodide ion with one oxygen atom

A form of iodine with two oxygen atoms

A diatomic iodine molecule

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What type of reaction is involved in the iodination of tyrosine residues?

Radical substitution

Electrophilic aromatic substitution

Hydrogenation

Nucleophilic substitution

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How are T3 and T4 hormones released from thyroglobulin?

Through a radical coupling mechanism

By direct diffusion into the bloodstream

Via proteolytic cleavage by proteases

Through passive transport

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the primary function of T3 in the body?

To regulate calcium levels

To store energy

To decrease metabolic rate

To increase metabolic rate

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