Question

metabolism is controlled by the—
o digestive system.
o circulatory system.
o endocrine system.
o respiratory system.

Explanation:

The endocrine system secretes hormones that regulate metabolism. Hormones like thyroxine (from the thyroid gland) and insulin (from the pancreas) play key - roles in controlling metabolic rate, energy use, and nutrient processing.

Answer:

Endocrine system.