Answer:

Source of secretion:

1) Thyroxine: Thyroid gland

2) Insulin: β cells of Islet of Langerhans of Pancreas

3) Growth Hormone: Anterior Pituitary gland.

Functions of these hormones:

1) Thyroxine: It plays a vital role in digestion, heart and muscle function, brain development and maintenance of bones.

2) Insulin: maintains the blood sugar level by facilitating the uptake of glucose in hepatocytes and adipocytes thus maintaining hypoglycemia in the bloodstream.

3) Growth Hormone: raises the concentration of glucose and free fatty acids in blood helping with the growth and anabolic effects on the body tissues.

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Answer:

Thyroid hormones are two hormones produced and released by the thyroid gland, namely triiodothyronine and thyroxine. They are tyrosine-based hormones that are primarily responsible for regulation of metabolism. T₃ and T₄ are partially composed of iodine

Insulin is a peptide hormone produced by beta cells of the pancreatic islets; it is considered to be the main anabolic hormone of the body. It regulates the metabolism of carbohydrates, fats and protein by promoting the absorption of glucose from the blood into liver, fat and skeletal muscle cells.

Growth hormone is a protein hormone of about 190 amino acids that is synthesized and secreted by cells called somatotrophs in the anterior pituitary. It is a major participant in control of several complex physiologic processes, including growth and metabolism.

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