Somatotrophin is another name of which hormone ?

Question

Accepted Answer

The correct option is (2):

Somatotrophin (STH) is the official scientific term for the hormone commonly known as Growth Hormone (GH). This hormone is synthesized and secreted by the somatotropic cells, which are a type of cell located in the anterior pituitary gland. Its name is highly descriptive: 'Somato' refers to the body, and 'trophin' means to stimulate or nourish. Therefore, Somatotrophin is the key anabolic peptide hormone responsible for promoting growth in all body tissues, including stimulating cell reproduction, regeneration, and linear growth, especially during childhood and adolescence. A proper understanding of this technical name is vital for students studying the endocrine system and human physiology.

The incorrect option is (1):
The incorrect option is (1): Adrenaline, also known as Epinephrine, is a catecholamine hormone and neurotransmitter produced mainly by the medulla of the adrenal glands. Its function is entirely different from Somatotrophin, as it plays a central role in the body's immediate stress response, famously known as the 'fight or flight' mechanism. Adrenaline rapidly increases heart rate, blood pressure, and energy supply (via glucose and fat metabolism) but is not involved in long-term body growth or tissue repair, which are the primary functions of Growth Hormone.

The incorrect option is (3):
The incorrect option is (3): Thyroid Stimulating Hormone (TSH) is also produced by the anterior pituitary gland, like Somatotrophin. However, TSH's specific and sole function is to regulate the endocrine function of the thyroid gland. It stimulates the thyroid to produce and secrete its own hormones, notably Thyroxine (T4) and Triiodothyronine (T3), which are critical for regulating metabolism. TSH is not involved in directly promoting somatic growth, differentiating its role from Somatotrophin.

The incorrect option is (4):
The incorrect option is (4): Prolactin (PRL) is another peptide hormone secreted by the anterior pituitary gland. While it shares a common origin with Somatotrophin, its biological functions are distinct. Prolactin's most well-known role in mammals is to stimulate and maintain lactation (milk production) after childbirth. It also plays a role in various reproductive, metabolic, and immune functions, but it does not carry the title or primary function of stimulating general body growth, which is exclusively the domain of Somatotrophin.