INI-CET EXAM -2025
Anatomy and Physiology
Easy
Which of the following histology image is not an endocrine structure?
Appeared in: INI-CET EXAM -2025
Explanation
- The image in option D shows the characteristic features of a serous salivary gland, which is an exocrine gland.
- Exocrine glands, like salivary glands, are defined by the presence of ducts that transport their secretions (e.g., saliva) to a specific location, such as the oral cavity.
- The image displays tightly packed serous acini and intercalated ducts, which are classic histological features of the parotid gland, a major salivary gland.
- Unlike endocrine glands that secrete hormones directly into the bloodstream, this structure is designed for external secretion through a duct system.
Why Other Options Were Wrong
- Option A: Image A shows the thyroid gland, which is a major endocrine gland. The presence of follicles filled with colloid is its defining histological feature. It secretes thyroid hormones directly into the bloodstream.
- Option B: Image B shows an Islet of Langerhans within the pancreas. While the pancreas has both exocrine and endocrine functions, the Islets are purely endocrine structures that secrete hormones like insulin and glucagon.
- Option C: Image C shows the adrenal gland, another key endocrine organ. The cells are arranged in cords and are responsible for producing vital steroid hormones like cortisol and aldosterone.
Related Visual
Clinical Relevance
- Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Distinguishing between endocrine and exocrine gland histology as background academic context rather than a clinical decision trigger.
- Understanding the histological difference between endocrine and exocrine glands is fundamental for diagnosing various pathologies, such as tumors. For example, an adenocarcinoma (a malignant tumor of an exocrine gland) will have a different microscopic appearance and behavior than an adenoma of an endocrine gland.
- In nursing, knowing the function of these glands is crucial for patient care. A patient with thyroid dysfunction (Image A) will have metabolic issues, while a patient with salivary gland issues (Image D) might experience dry mouth (xerostomia) or problems with digestion.
- What if? If the Islet of Langerhans in Image B was destroyed (as in Type 1 Diabetes), the body would lose its ability to produce insulin, leading to hyperglycemia. This highlights the critical endocrine function within a mixed gland.
How to Approach the Question
- First, analyze the question's core task: identify the image that is not an endocrine structure. The keyword 'not' is critical.
- Examine each image for key histological features. Look for ducts, cell arrangement (follicles, cords, acini), and secretion products (colloid).
- Recall the definition of endocrine vs. exocrine glands. Endocrine glands are ductless and secrete hormones into the blood. Exocrine glands have ducts and secrete products onto a surface.
- Identify the tissue in each image: A = Thyroid, B = Pancreatic Islet, C = Adrenal Gland, D = Salivary Gland.
- Classify each identified tissue as endocrine or exocrine.
- Select the option that corresponds to the exocrine gland, as it is the one that is 'not an endocrine structure'.
Concept Tested & Keywords
- Concept Tested: Distinguishing between endocrine and exocrine gland histology.
- Stem keywords: histology, endocrine structure, exocrine structure
- Lead-in keywords: not
- Negative lead-in flag: The question asks to identify the option that is NOT an endocrine structure.
Question ID
QCCsvUa9wFQRTxQfElSwmW
Reference Book
E6 Histology Inderbir 11e pp. 63-65, 145-147, 143-145
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