Select the Statement That Best Describes the Formation of Triiodothyronine

question 4

Multiple Choice

Select the statement that best describes the formation of triiodothyronine (T₃) and thyroxine (T₄) .

• A) The secretion of T₃ and T₄ is under the control of the hypothalamic-anterior pituitary-thyroid axis. The hypothalamus secretes TSH (thyroid-stimulating hormone), which travels in the portal vein to the anterior pituitary. The anterior pituitary is then stimulated to secrete TRH (thyrotropin-releasing hormone) into the bloodstream. TRH binds to receptors on the plasma membrane of the thyroid gland, stimulating the production of T₃ and T₄.
• B) The secretion of thyrocalcitonin is under the control of the hypothalamic-anterior pituitary-thyroid axis. The hypothalamus secretes thyrocalcitonin, which travels in the portal vein to the anterior pituitary. The anterior pituitary is then stimulated to secrete TSH (thyroid-stimulating hormone) into the bloodstream. TSH binds to receptors on the plasma membrane of the thyroid gland, stimulating the production of T₃ and T₄.
• C) The secretion of T₃ and T₄ is under the control of the hypothalamic-anterior pituitary-thyroid axis. The hypothalamus secretes TRH (thyrotropin-releasing hormone), which travels in the portal vein to the anterior pituitary. The anterior pituitary is then stimulated to secrete TSH (thyroid-stimulating hormone) into the bloodstream. TSH binds to receptors on the plasma membrane of the thyroid gland, stimulating the production of T₃ and T₄.
• D) None of these are correct.

Learn the impact of mutations on genetic diseases and conditions (e.g., cancer, Tay-Sachs disease, hemophilia).

Comprehend the concept of temperature-sensitive mutations and their effects on gene expression and phenotype.

Recognize the genetic basis and implications of common and rare genetic disorders caused by specific mutations.

Understand mechanisms of mutation induction (e.g., exposure to certain chemicals or environmental factors).

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Definitions:

Naturalistic Observation

Naturalistic observation is a research method in which subjects are observed in their natural environment without any intervention by the researcher.

Accurate Picture

A precise or true representation of a situation, phenomenon, or condition based on factual information.

Case Study

An in-depth analysis of a single instance, situation, or individual, often used to explore complex issues in a real-life context.

Observational Method

A technique in research where behavior is observed and recorded in a natural setting without intervention.