T3

Definition

T3, or triiodothyronine, is a thyroid hormone that plays a crucial role in the body's metabolic processes. It influences various functions such as heart rate, body temperature, and growth development.

5 Must Know Facts For Your Next Test

1. T3 is more potent than T4 but is present in smaller quantities in the bloodstream.
2. It is primarily produced from the conversion of T4 (thyroxine) in peripheral tissues.
3. Adequate dietary iodine intake is essential for the synthesis of both T3 and T4 hormones.
4. T3 levels can be affected by nutritional deficiencies, particularly those involving selenium and zinc.
5. Clinical symptoms of abnormal T3 levels include changes in weight, energy levels, and overall metabolic rate.

Review Questions

• What are the primary functions of T3 in the human body?
• How does nutritional intake influence T3 production?
• What are common clinical symptoms associated with abnormal T3 levels?

Related terms

Thyroxine (T4): A thyroid hormone that serves as a precursor to T3 and regulates metabolism.

Iodine:

A trace element necessary for the synthesis of thyroid hormones including T3 and T4.

Hypothyroidism:

A condition characterized by insufficient production of thyroid hormones leading to a slowed metabolism.