Endocrine glands secrete?

RUHS, Jaipur, PB B.Sc Nursing Entrance-2021

Applied Physiology

Easy

Appeared in: RUHS, Jaipur, PB B.Sc Nursing Entrance-2021

Explanation

Endocrine glands are defined as ductless glands that synthesize and release their products directly into the bloodstream.
The chemical substances secreted by endocrine glands are called hormones.
Hormones act as chemical messengers, traveling through the circulatory system to target cells and organs to regulate a wide range of physiological processes, including metabolism, growth, and stress response.

Option A: Enzymes are biological catalysts primarily secreted by exocrine glands (e.g., salivary glands, pancreatic acinar cells) through ducts to act locally, such as in the digestive tract.
Option B: Cerebrospinal fluid (CSF) is a clear fluid produced by the choroid plexus in the ventricles of the brain. It circulates around the brain and spinal cord, providing cushioning and removing waste products; it is not a product of endocrine glands.
Option D: Water is the primary component of the body and is a major constituent of many secretions, but it is not the defining secretory product of endocrine glands. Water balance is regulated by hormones (like ADH from the pituitary), but water itself is secreted by exocrine glands like sweat glands.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Secretory function of endocrine glands as background academic context rather than a clinical decision trigger.
Understanding the function of endocrine glands is fundamental for nurses in managing patients with endocrine disorders, such as diabetes mellitus (insulin hormone imbalance) or hypothyroidism (thyroid hormone deficiency).
Nurses are responsible for administering hormonal medications (e.g., insulin injections, oral levothyroxine) and must monitor patients for therapeutic effects and potential side effects related to hormone excess or deficiency.
What if? a gland has both endocrine and exocrine functions? The pancreas is a key example. Its endocrine function involves the islets of Langerhans secreting insulin and glucagon into the blood, while its exocrine function involves acinar cells secreting digestive enzymes into the duodenum through a duct.

How to Approach the Question

This is a factual recall question that tests your basic knowledge of the endocrine system.
Identify the main subject of the question: 'Endocrine glands'.
Recall the definition of 'endocrine'. The prefix 'endo-' means 'within', and 'krine' means 'to secrete'. This implies secretion within the body, specifically into the bloodstream.
Evaluate each option based on this definition. Hormones are the specific chemical messengers that fit this description.
Eliminate the other options by recalling their origins: enzymes from exocrine glands, CSF from the brain's choroid plexus, and water as a general solvent rather than a specific endocrine product.

Concept Tested & Keywords

QPc77qLSRq8DRjzk67L1HN

E6 Physiology Review Sembulingam 5e p. 81-83

E6 Physiology Essentials Sembulingam 10e Part 2 pp. 16-18, 17-19