Thyroxine

question 7

Multiple Choice

Thyroxine

• A) is TSH.
• B) is T₄.
• C) exerts negative feedback control on the secretion of T₃.
• D) lowers basal metabolic rate.

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Definitions:

Zygote

The initial cell formed when a sperm cell fertilizes an egg cell, marking the beginning of a developing organism.

Myometrium

The muscular layer of the uterus that contracts during childbirth to help deliver the baby.

Uterus

A female reproductive organ in which the fertilized egg implants and develops into a fetus.

Endometrium

The mucous membrane lining the interior of the uterus, which thickens during the menstrual cycle in preparation for possible implantation of an embryo.