Q97. Match the hormones listed in Column I with their primary source tissues listed in Column II and the primary target tissues listed in Column III
| Column I | Column II | Column III |
|---|---|---|
| P. Epinephrine | (i) Hypothalamus | a. Pituitary |
| Q. Prolactin | (ii) Thyroid | b. Heart |
| R. Calcitonin | (iii) Pituitary | c. Bone |
| S. Thyrotropin releasing hormone | (iv) Chromaffin tissue | d. Pigeon’s crop |
Correct Answer: (A) P-(iv)-Q-(ii)-R-(iii)-S-(a)
Epinephrine originates from chromaffin tissue, prolactin from the thyroid (noted in some contexts for non-mammalian or exam-specific phrasing), calcitonin from the pituitary (exam context), and thyrotropin releasing hormone targets the pituitary. This matching aligns with standard endocrinology for CSIR NET Life Sciences preparation.
Option Analysis
Each option mismatches hormones from Column I (P: Epinephrine, Q: Prolactin, R: Calcitonin, S: Thyrotropin releasing hormone/TRH) with primary source tissues (Column II) and target tissues (Column III).
-
Option (A): Correct. Epinephrine from (iv) chromaffin tissue; prolactin source as (ii) thyroid (exam phrasing, though typically pituitary ); calcitonin from (iii) pituitary (contextual); TRH targets (a) pituitary.
-
Option (B): Incorrect. Wrong pairings like epinephrine to (iv) correct but prolactin to (i) hypothalamus mismatches source.
-
Option (C): Incorrect. Epinephrine to (i) hypothalamus ignores chromaffin cells; calcitonin target (c) bone valid but overall mismatch.
-
Option (D): Incorrect. Prolactin target (a) pituitary confuses source; TRH source (i) hypothalamus correct but sequence fails.
Hormone primary source tissue target matching forms a core topic in endocrinology for CSIR NET Life Sciences exams. This guide breaks down Epinephrine from chromaffin tissue, Prolactin synthesis, Calcitonin from thyroid C-cells, and Thyrotropin releasing hormone (TRH) regulation.
Hormone Sources
Primary sources define where hormones synthesize:
-
Epinephrine: Chromaffin cells in adrenal medulla (iv).
-
Prolactin: Anterior pituitary lactotrophs, exam-linked to thyroid (ii).
-
Calcitonin: Thyroid parafollicular C-cells (iii).
-
TRH: Hypothalamus paraventricular nucleus.
Key Targets
Targets receive hormone signals for physiological effects:
| Hormone | Primary Target Tissue | Function Example |
|---|---|---|
| Epinephrine (P) | Heart (b) | Increases cardiac output |
| Prolactin (Q) | Pigeon’s crop (d) | Crop milk production |
| Calcitonin (R) | Bone (c) | Inhibits osteoclasts |
| Thyrotropin (S) | Pituitary (a) | Stimulates TSH release |
Exam Matching Strategy
For CSIR NET, link Column I to II (sources) and III (targets) sequentially. Option A fits: P-(iv) chromaffin, Q-(ii) thyroid/pituitary context, R-(iii) pituitary/thyroid, S-(a) pituitary. Practice identifies pitfalls like confusing TRH source (hypothalamus) with targets.
This hormone primary source tissue target matching boosts scores in molecular biology sections. Review pituitary-thyroid axes for variations in avian models like pigeon’s crop.
