ESIC Nursing Officer -2019 (Shift -1)
Applied Physiology
Easy
When a person's blood pressure drops, the kidneys respond by:
Appeared in: ESIC Nursing Officer -2019 (Shift -1)
Explanation
- When blood pressure falls, specialized cells in the kidney (juxtaglomerular apparatus) detect the change.
- This detection triggers the immediate release of the enzyme renin from the kidneys.
- Renin is the first step in the Renin-Angiotensin-Aldosterone System (RAAS), a hormonal cascade designed to raise blood pressure.
- This action directly counteracts the initial drop in blood pressure by initiating a series of events to restore homeostasis.
Why Other Options Were Wrong
- Option B: Increasing urine output would cause further fluid loss, which would decrease blood volume and lower blood pressure even more. This is the opposite of the body's compensatory mechanism for hypotension.
- Option C: Aldosterone is a key hormone in raising blood pressure, but it is produced and secreted by the adrenal cortex (adrenal glands), not the kidneys. The kidneys only signal for its release via the renin-angiotensin pathway.
- Option D: A drop in blood pressure is a potent stimulus for the release of Antidiuretic Hormone (ADH) from the posterior pituitary gland. ADH promotes water reabsorption in the kidneys to increase blood volume. Therefore, ADH release would be increased, not slowed.
Related Visual
- Visual 1: Flowchart - A clear diagram of the Renin-Angiotensin-Aldosterone System (RAAS). This visual should trace the pathway from the initial stimulus (low BP), through renin secretion, angiotensin conversion, and the final effects of angiotensin II and aldosterone on blood vessels and the kidneys.
Clinical Relevance
- Nursing practice connection: Knowing Renal regulation of blood pressure and the Renin-Angiotensin-Aldosterone System (RAAS) helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
- Understanding the RAAS is fundamental for nurses managing patients with hypertension, heart failure, and kidney disease.
- Many common blood pressure medications, such as ACE inhibitors (e.g., lisinopril) and Angiotensin II Receptor Blockers (ARBs) (e.g., losartan), work by interrupting the RAAS cascade.
- A nurse monitoring a patient on an ACE inhibitor would watch for side effects like hypotension (low blood pressure) and a persistent dry cough, which are directly related to the drug's mechanism of action on the RAAS.
How to Approach the Question
- First, identify the core physiological process in the question: the body's response to a drop in blood pressure, specifically involving the kidneys.
- Recall the key hormonal systems involved in blood pressure regulation. The Renin-Angiotensin-Aldosterone System (RAAS) is the primary mechanism initiated by the kidneys.
- Trace the steps of the RAAS cascade in your mind: What is the very first step the kidney takes?
- Evaluate each option against this physiological pathway. 'Secreting renin' is the initial action of the kidney in this cascade.
- Eliminate the other options by identifying why they are incorrect. Increasing urine output would worsen the problem. Aldosterone is from the adrenal gland. ADH release would increase, not slow.
Concept Tested & Keywords
- Concept Tested: Renal regulation of blood pressure and the Renin-Angiotensin-Aldosterone System (RAAS).
- Stem keywords: blood pressure drops, kidneys respond
- Lead-in keywords: BEST, MOST RELEVANT CLUE
- Negative lead-in flag: false
Question ID
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Practise the full ESIC Nursing Officer -2019 (Shift -1)
Attempt every question from this paper in a timed mock, then review the full solution for each one.
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