Problem 102 - Objective Biology for NEET

Question

Match the column: Column I (Production Site) A. Atrial wall B. Thyroid gland C. Parathyroid D. GIT Column II (Hormones) 1\. ANF 2\. PTH 3\. \(\mathrm{T}_{3}, \mathrm{~T}_{4}, \mathrm{TCT}\) 4\. CCK, GIP, gastrin and secretin (a) \(\mathrm{A}-2, \mathrm{~B}-4, \mathrm{C}-1, \mathrm{D}-3\) (b) \(\mathrm{A}-1, \mathrm{~B}-3, \mathrm{C}-2, \mathrm{D}-4\) (c) \(\mathrm{A}-4, \mathrm{~B}-2, \mathrm{C}-3, \mathrm{D}-1\) (d) \(\mathrm{A}-4, \mathrm{~B}-3, \mathrm{C}-2, \mathrm{D}-1\)

Step-by-Step Solution

Answer

The correct option that matches the hormones with their respective production sites is option (b): A-1, B-3, C-2, D-4.

Step 1: Identify the Production Site of Each Hormone

The production sites of these hormones are generally known in biology: \n- ANF (Atrial Natriuretic Factor) is produced by the atrial wall of the heart. \n- PTH (Parathyroid Hormone) comes from the parathyroid gland. \n- T3, T4, and TCT (Thyroid hormones) are produced by the thyroid gland. \n- CCK (Cholecystokinin), GIP (Gastric Inhibitory Peptide), Gastrin, and Secretin are all hormones produced in the Gastrointestinal Tract (GIT).

Step 2: Match the Hormones with their Production Sites

Now, it's time to match the hormones with their sites of production: \n- A. Atrial wall matches with 1. ANF \n- B. Thyroid gland matches with 3. T3, T4, TCT \n- C. Parathyroid matches with 2. PTH \n- D. GIT matches with 4. CCK, GIP, Gastrin, and Secretin.

Step 3: Find the Correct Option

Comparing the matches obtained in Step 2 with the options provided in the exercise, it can be seen that the correct match is option (b): A-1, B-3, C-2, D-4.

Key Concepts

Hormone Production Sites

Hormones are chemical messengers that regulate various functions in the body. Each hormone has a specific production site, which reflects its function and role. Understanding these sites can help us comprehend how the body's regulatory systems work.

• The atrial wall of the heart is where Atrial Natriuretic Factor (ANF) is produced. This site is crucial as the heart directly influences blood pressure and volume through ANF release.
• The thyroid gland is responsible for producing thyroid hormones such as T3 (triiodothyronine), T4 (thyroxine), and TCT (thyrocalcitonin). These hormones are vital for regulating metabolism.
• The parathyroid glands, small glands located behind the thyroid, produce the Parathyroid Hormone (PTH), which is essential for calcium regulation in the blood.
• Hormones like CCK, GIP, gastrin, and secretin are produced in the gastrointestinal tract (GIT), playing key roles in digestion and absorption processes.

Recognizing the link between hormone production sites and their functions is fundamental to comprehending endocrine system operations.

Atrial Natriuretic Factor

The Atrial Natriuretic Factor (ANF) is a hormone produced by the cells in the atrial wall of the heart. Its primary function is to reduce blood pressure by multiple mechanisms.

• ANF increases the rate of sodium ion excretion in the kidneys, promoting water flow out of the blood, thus lowering blood volume.
• It also dilates blood vessels, reducing resistance and further lowering blood pressure.

The regulation of ANF is a response primarily to high blood pressure or increased blood volume, making it a critical component in cardiovascular health management. Understanding its role can help in the study of heart function and its impact on the overall fluid balance in the body.

Parathyroid Hormone

Parathyroid Hormone (PTH) is secreted by the parathyroid glands, found in close proximity to the thyroid gland. This hormone plays a pivotal role in maintaining calcium homeostasis in the blood.

• PTH increases blood calcium levels by stimulating osteoclasts to break down bone tissue, releasing calcium into the bloodstream.
• It enhances the kidneys' ability to retain calcium and excrete phosphate, also increasing calcium absorption from the diet by activating vitamin D.

This intricate balance is essential for various physiological processes such as bone formation, nerve transmission, and muscle contraction. Disruptions in PTH levels can cause significant health issues, highlighting its importance in endocrine and bone health.

Thyroid Hormones

Thyroid hormones such as T3 (triiodothyronine), T4 (thyroxine), and TCT (thyrocalcitonin) are produced by the thyroid gland located in the neck. These hormones are vital to numerous metabolic processes in the body.

• T3 and T4 are primarily involved in regulating metabolism, influencing how the body converts food into energy. They manage metabolic rate, heart rate, and even neural development.
• Thyrocalcitonin, another thyroid hormone, helps in lowering blood calcium levels, providing a counter-regulatory effect to the parathyroid hormone.

A proper balance of thyroid hormones is crucial for growth, development, and maintaining energy levels. Disorders such as hypothyroidism and hyperthyroidism result from imbalances, affecting the entire body's function and health.