Which hormone regulates the body's metabolic rate?
A
Insulin
B
Thyroxine
C
Adrenaline
D
Estrogen
Correct Answer: Option B — Thyroxine
Explanation:
Thyroxine, produced by the thyroid gland, regulates metabolism by controlling how quickly cells use energy and produce heat. Imbalances in thyroxine levels can cause conditions such as hyperthyroidism or hypothyroidism, affecting overall body function.