Problem 139 - Arihant Objective Approach to Organic Chemistry for IIT JEE and NEET all Medical Entrances Part 4

Question

Name those biomolecules which are secreted by the endocrine glands: [DPMT 2000] (a) blood (b) hormones (c) vitamin (d) enzyme

Step-by-Step Solution

Answer

Endocrine glands secrete (b) hormones.

Step 1: Identify the Function of Endocrine Glands

Endocrine glands are specialized structures in the body that release specific types of biomolecules. These glands do not have ducts and release their secretions directly into the bloodstream. The primary function of endocrine glands is to secrete hormones, which are chemical messengers that regulate various functions in the body.

Step 2: Evaluate the Biomolecules Listed

Let's review the options: - (a) Blood is a connective tissue and not a secretion of endocrine glands. - (b) Hormones are indeed secreted by endocrine glands and serve as chemical messages. - (c) Vitamins are obtained from the diet and not secreted by endocrine glands. - (d) Enzymes are typically secreted by exocrine glands, like those in the digestive system, rather than endocrine glands.

Step 3: Select Hormones as the Correct Answer

Based on the analysis, the correct response to the query regarding which biomolecules are secreted by endocrine glands is (b) hormones. Endocrine glands mainly secrete hormones to regulate diverse physiological activities in the body.

Key Concepts

Hormones

Hormones are fascinating biomolecules that play a crucial role in the body's internal coordination. They are released directly into the bloodstream by endocrine glands, allowing them to travel to various organs and tissues. These chemical messengers facilitate communication between different parts of the body, influencing numerous processes such as metabolism, growth, and mood regulation.

Hormones work through specific receptors on target cells. Imagine hormones as keys, and their corresponding receptors as locks. Once a hormone binds to its receptor, it triggers a specific response in the cell. This response can vary from gene activation, enzyme synthesis, or alteration in cell permeability.

Examples of hormones include insulin, which regulates blood sugar levels, and adrenaline, which prepares the body for a "fight or flight" response. Understanding hormones and their functions provides insight into how our body maintains balance and responds to external changes.

Biomolecules

Biomolecules encompass a diverse range of organic molecules essential for life, including hormones, proteins, nucleic acids, and carbohydrates. Among these, hormones are specifically secreted by endocrine glands, distinguishing them from other biomolecules in terms of origin and function.

It is important to differentiate hormones from other biomolecules like enzymes or vitamins. Enzymes, for example, facilitate biochemical reactions but are generally produced by exocrine glands. Vitamins, on the other hand, are mostly obtained from dietary sources and are not synthesized by the body's endocrine glands. This special characteristic makes hormones unique biomolecules involved in direct physiological regulation via endocrine pathways.

Appreciating the specific role of hormones as biomolecules helps in recognizing how different systems in the body are interlinked and harmonized to ensure optimal functioning.

Physiological Regulation

Physiological regulation is the body's way of maintaining a stable internal environment, known as homeostasis. Hormones are key players in this process, acting through intricate feedback systems to modulate body functions. For instance, when blood glucose levels rise, the pancreas secretes insulin to facilitate glucose uptake by cells, thereby balancing blood sugar levels.

Another example is the regulation of calcium levels by the parathyroid hormone. If calcium levels drop, this hormone is secreted to increase calcium absorption and maintain bone health. Hormones are integral to numerous regulations, including sleep cycles, immune response, and reproductive systems.

The body's ability to adjust to stress, change, and its daily rhythms is largely due to hormone-driven physiological regulation. Understanding these systems underscores the importance of hormones in health and disease, highlighting why their balance is crucial for well-being.