• Deiodinase
• Depolarization
• Duodenum
• Dyspareunia

The enzyme found in target tissues of the thyroid hormones that converts thyroxine (also known as tetraiodothyronine or T₄) to triiodothyronine (T₃).

Specifically, 5'-deiodinase converts T₄ to the active form of the thyroid hormone, T₃.

5-Deiodinase converts T₄ to the inactive form of the thyroid hormone, reverse T₃ (rT₃).

Refers to a change in the value of the membrane potential, where the membrane potential becomes less negative (or more positive) than the resting membrane potential.

Repolarization
Hyperpolarization

Resting Membrane Potential - Introduction
Figure showing depolarization, repolarization, and hyperpolarization

The first region (i.e., most proximal region) of the small intestine. Chyme leaving the stomach (through the pyloric valve) first enters the duodenum. The contents of the duodenum empty into the jejunum (middle region of the small intestine). In adult humans, the duodenum is about 25-38 cm (10-15 inches) long.

Jejunum
Ileum

Difficult or painful intercourse.