Question

What are the actions of Thyroid Hormones?

1) Additional sodium-potassium pumps
2) Increased metabolic rate
3) Increased heart rate
4) Increased bone density

Answer 1

Thyroid hormones, including thyroxine (T4) and triiodothyronine (T3), increase the basal metabolic rate, heart rate, and sensitivity to catecholamines. They are essential for energy production, growth, and normal development, especially of the nervous system.

Step-by-step explanation:

The actions of Thyroid Hormones are crucial in regulating various bodily functions. The hormone thyroxine (T4) and triiodothyronine (T3) are produced by the thyroid gland. These hormones play key roles in:

• Regulating the basal metabolic rate by increasing the production of ATP, which increases energy consumption and heat production in cells.
• Enhancing the heart's function by increasing heart rate and contractility, also known as the calorigenic effect.
• Promoting normal development and growth in fetal and childhood tissues.

Furthermore, thyroid hormones assist in the development of the nervous system, influence reproductive functions, and increase the body's sensitivity to catecholamines. Excess levels can cause tachycardia (increased heart rate) and other symptoms.