Problem 138 - Objective Biology for NEET

Question

Assertion: Failure of secretion of somatotropin from an early age causes dwarfism in the patient. Reason: Somatotropin hormone stimulates the body growth and elongation of long bones.

Step-by-Step Solution

Answer

The statement and the reason given are correct. The somatotropin hormone is critical in stimulating body growth and bone elongation. Its absence from an early age can indeed lead to dwarfism.

Step 1: Understanding the Assertion

The assertion states that the absence of somatotropin from an early age causes dwarfism in the patient. Dwarfism is a condition characterized by short stature, often due to a genetic or medical condition.

Step 2: Understanding the Reason

The reason given is that the hormone somatotropin stimulates body growth and elongation of long bones. This would explain why a lack of it could result in dwarfism. To verify this, understanding the function and role of somatotropin hormone in the human body is necessary.

Step 3: Examining the Correlation

Somatotropin hormone, also known as human growth hormone, is produced by the pituitary gland. Its primary roles are to stimulate growth in children and adolescents, and it also helps to regulate body composition, body fluids, muscle and bone growth, and potentially heart function as well. So, absence from an early age could indeed cause dwarfism, as the body would not be receiving the signals to grow and elongate the bones.

Key Concepts

Somatotropin

Somatotropin is a critical hormone in our body that plays a vital role in growth and development. It is more commonly known as the growth hormone. This hormone is responsible for stimulating protein synthesis, which is essential for cell growth and maintaining tissues throughout the body. The body needs somatotropin to properly develop and function.

Somatotropin functions in several essential ways:

• Encourages the growth of long bones during the early years, which is crucial for height increase.
• Promotes the production of proteins and the use of fats as energy, assisting in maintaining lean muscle mass.
• Enhances the metabolism of carbohydrates, playing a role in managing blood sugar levels.

Without adequate levels of somatotropin, individuals may experience consequences such as dwarfism, where growth is stunted due to ineffective stimulation of the body’s growth receptors. In children, this can lead to noticeable short stature. Therefore, understanding somatotropin’s role helps to comprehend why its absence profoundly impacts growth.

Human Growth Hormone

Human growth hormone (HGH) is a naturally-occurring peptide hormone secreted by the pituitary gland. It not only promotes growth through childhood and adolescence but also has various other functions in adults. HGH is crucial for maintaining healthy body composition, bone density, and muscles.

The functions of human growth hormone include:

• Stimulating the growth of all tissues, inclusive of bones and muscles.
• Regulating metabolism to efficiently process proteins, fats, and carbohydrates.
• Contributing to the repair of tissues and growth of new cells.

HGH influences many processes in the human body, impacting physical structure and appearance. Insufficient amounts can lead to growth disorders and affect body composition and function. Understanding HGH is crucial for recognizing its importance in growth and development, particularly in diagnosing conditions such as dwarfism.

Pituitary Gland

The pituitary gland is a small, yet highly significant, gland located at the base of the brain. Often referred to as the "master gland," it controls various hormonal functions in the body by secreting several hormones, including somatotropin.

Here are some key functions of the pituitary gland:

• Produces essential hormones like thyroid-stimulating hormone (TSH) and adrenocorticotropic hormone (ACTH) that regulate other endocrine glands.
• Controls growth and development through growth hormone (somatotropin) secretion.
• Maintains physiological homeostasis by managing aspects like water balance and reproduction.

The pituitary gland plays a pivotal role in bridging the communication between the nervous system and endocrine system. Its ability to release somatotropin is crucial for natural growth and development. It ensures the signals for body growth are effectively transmitted, thereby influencing how we grow and mature through each life stage. If there is a deficiency or dysfunction in the pituitary gland, it can lead to conditions like dwarfism, highlighting the gland’s importance.