Thyroxine Is a Peptide Hormone, but Its Mechanism Is Different

question 28

Multiple Choice

Thyroxine is a peptide hormone, but its mechanism is different from other peptide hormones. Which of the following statements is true concerning this difference?

• A) It is very specific in the cell type it targets.
• B) It is a stimulant of cellular metabolism and targets all cells.
• C) It does not require a second messenger to effect a response.
• D) It causes positive feedback.

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Definitions:

Serious Mental Illness

A mental, behavioral, or emotional disorder resulting in serious functional impairment, which substantially interferes with or limits one or more major life activities.

Psychotropic Medication

Drugs that affect the mind, emotions, and behavior and are used to treat psychiatric disorders.

Homicidal Ideation

Thoughts about homicide, which can range from vague ideas of wanting to harm someone to detailed plans.

Psychosis

A mental disorder characterized by a disconnect from reality, often featuring hallucinations, delusions, and impaired thought processes.