Conceptual Pre-med/IB-style questions on the renin–angiotensin–aldosterone system (RAAS) and antidiuretic hormone (ADH): why these systems exist, what triggers them, how they amplify signals, how they change urine composition, and how they interact during dehydration, hemorrhage, salt/water loads, and common physiology-style scenarios.
Which change most directly stimulates renin release from juxtaglomerular (JG) cells?
Source: entermedschool.org
<!-- RAAS & ADH: Blood Pressure and Osmoregulation — EnterMedSchool -->
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src="https://entermedschool.org/embed/questions#{"title":"RAAS & ADH: Blood Pressure and Osmoregulation","questions":[{"prompt":"Which change most directly stimulates renin release from juxtaglomerular (JG) cells?","options":[{"label":"A","body":"Increased stretch/pressure in the afferent arteriole wall","isCorrect":false},{"label":"B","body":"Decreased stretch/pressure in the afferent arteriole wall","isCorrect":true},{"label":"C","body":"Increased NaCl delivery to the macula densa","isCorrect":false},{"label":"D","body":"Increased angiotensin II levels","isCorrect":false},{"label":"E","body":"Increased atrial stretch (high venous return)","isCorrect":false}],"explanation":"JG cells act like intrarenal “baroreceptors”: reduced afferent arteriole pressure/stretch triggers renin release. High NaCl delivery and high angiotensin II tend to suppress renin (negative feedback), and atrial stretch promotes ANP, which also opposes renin."},{"prompt":"Renin is best described as:","options":[{"label":"A","body":"A steroid hormone that enters nuclei to change transcription","isCorrect":false},{"label":"B","body":"An enzyme that converts angiotensinogen into angiotensin I","isCorrect":true},{"label":"C","body":"An enzyme that converts angiotensin I into angiotensin II","isCorrect":false},{"label":"D","body":"A channel that inserts aquaporins into membranes","isCorrect":false},{"label":"E","body":"A hormone secreted by the posterior pituitary","isCorrect":false}],"explanation":"Renin is a protease enzyme released by JG cells. It cleaves angiotensinogen (from the liver) to form angiotensin I; ACE later converts angiotensin I to angiotensin II."},{"prompt":"Angiotensin-converting enzyme (ACE) most directly catalyzes:","options":[{"label":"A","body":"Angiotensin II → aldosterone","isCorrect":false},{"label":"B","body":"Angiotensinogen → angiotensin I","isCorrect":false},{"label":"C","body":"Angiotensin I → angiotensin II","isCorrect":true},{"label":"D","body":"Renin → angiotensin I","isCorrect":false},{"label":"E","body":"ADH → aldosterone","isCorrect":false}],"explanation":"ACE converts angiotensin I into angiotensin II. Angiotensin II then drives vasoconstriction and stimulates aldosterone and ADH release."},{"prompt":"Severe liver failure would most directly reduce which RAAS component, lowering the body’s ability to generate angiotensin II?","options":[{"label":"A","body":"Renin production","isCorrect":false},{"label":"B","body":"Angiotensinogen production","isCorrect":true},{"label":"C","body":"ACE production","isCorrect":false},{"label":"D","body":"Aldosterone receptor production","isCorrect":false},{"label":"E","body":"ADH synthesis","isCorrect":false}],"explanation":"Angiotensinogen is made mainly by the liver. Renin is produced by the kidney, ACE is largely associated with vascular endothelium, aldosterone is from the adrenal cortex, and ADH is synthesized in the hypothalamus."},{"prompt":"Which is NOT a typical effect of angiotensin II?","options":[{"label":"A","body":"Vasoconstriction that increases blood pressure","isCorrect":false},{"label":"B","body":"Stimulation of aldosterone secretion","isCorrect":false},{"label":"C","body":"Stimulation of thirst and ADH release","isCorrect":false},{"label":"D","body":"Decreased Na+ reabsorption in the proximal tubule","isCorrect":true},{"label":"E","body":"Constriction of the efferent arteriole in the kidney","isCorrect":false}],"explanation":"Angiotensin II generally increases Na+ reabsorption (including in the proximal tubule), raises blood pressure by vasoconstriction, and promotes aldosterone/ADH/thirst. Decreasing proximal Na+ reabsorption would oppose the goal of restoring volume/pressure."},{"prompt":"During low renal perfusion, angiotensin II helps maintain GFR primarily by causing:","options":[{"label":"A","body":"Dilation of the efferent arteriole","isCorrect":false},{"label":"B","body":"Constriction of the efferent arteriole","isCorrect":true},{"label":"C","body":"Constriction of the afferent arteriole","isCorrect":false},{"label":"D","body":"Closure of Bowman’s capsule","isCorrect":false},{"label":"E","body":"Immediate destruction of the filtration barrier","isCorrect":false}],"explanation":"Efferent arteriole constriction increases glomerular capillary hydrostatic pressure, helping support GFR when renal blood flow drops. This is a classic “protect filtration” RAAS effect (within limits)."},{"prompt":"Aldosterone is secreted primarily by the:","options":[{"label":"A","body":"Posterior pituitary","isCorrect":false},{"label":"B","body":"Zona glomerulosa of the adrenal cortex","isCorrect":true},{"label":"C","body":"Adrenal medulla","isCorrect":false},{"label":"D","body":"Pancreatic alpha cells","isCorrect":false},{"label":"E","body":"Kidney collecting duct cells","isCorrect":false}],"explanation":"Aldosterone is a mineralocorticoid produced by the adrenal cortex (zona glomerulosa). It acts on the kidney to increase Na+ reabsorption and K+ secretion."},{"prompt":"In principal cells of the late distal tubule/collecting duct, aldosterone most directly increases:","options":[{"label":"A","body":"Water permeability by inserting aquaporin-2 channels","isCorrect":false},{"label":"B","body":"Na+ reabsorption and K+ secretion","isCorrect":true},{"label":"C","body":"Glucose reabsorption via SGLT transporters","isCorrect":false},{"label":"D","body":"Urea secretion into the tubule lumen","isCorrect":false},{"label":"E","body":"Ca2+ reabsorption as the primary effect","isCorrect":false}],"explanation":"Aldosterone upregulates ENaC and the Na+/K+ ATPase, leading to increased Na+ reabsorption and increased K+ secretion. Aquaporin-2 insertion (water permeability) is mainly controlled by ADH, not aldosterone."},{"prompt":"Which stimulus can increase aldosterone secretion even if renin is low?","options":[{"label":"A","body":"Low plasma K+","isCorrect":false},{"label":"B","body":"High plasma K+","isCorrect":true},{"label":"C","body":"Low plasma osmolality","isCorrect":false},{"label":"D","body":"High atrial stretch (high blood volume)","isCorrect":false},{"label":"E","body":"Low blood glucose","isCorrect":false}],"explanation":"Hyperkalemia can directly stimulate aldosterone release from the adrenal cortex. This is a common exam trap: aldosterone is not triggered only by renin/angiotensin II."},{"prompt":"ADH is synthesized in the ____ and released from the ____.","options":[{"label":"A","body":"Posterior pituitary; anterior pituitary","isCorrect":false},{"label":"B","body":"Hypothalamus; posterior pituitary","isCorrect":true},{"label":"C","body":"Kidney cortex; adrenal medulla","isCorrect":false},{"label":"D","body":"Liver; pancreas","isCorrect":false},{"label":"E","body":"Thyroid; parathyroid","isCorrect":false}],"explanation":"ADH (vasopressin) is made in hypothalamic neurons and transported down axons to the posterior pituitary, where it is stored and released into the blood."},{"prompt":"ADH increases water reabsorption most directly by acting on the ____ to insert ____ into the membrane.","options":[{"label":"A","body":"Proximal tubule; SGLT2","isCorrect":false},{"label":"B","body":"Collecting duct principal cells; aquaporin-2","isCorrect":true},{"label":"C","body":"Thick ascending limb; Na+/K+/2Cl− cotransporter","isCorrect":false},{"label":"D","body":"Glomerulus; collagen pores","isCorrect":false},{"label":"E","body":"Macula densa; chloride channels","isCorrect":false}],"explanation":"ADH increases collecting duct water permeability mainly by inserting aquaporin-2 into the apical membrane of principal cells, allowing water to be reabsorbed down the medullary osmotic gradient."},{"prompt":"If ADH levels rise (and the kidney responds normally), what happens to urine volume and urine osmolality?","options":[{"label":"A","body":"Urine volume increases; urine osmolality decreases","isCorrect":false},{"label":"B","body":"Urine volume decreases; urine osmolality increases","isCorrect":true},{"label":"C","body":"Both urine volume and urine osmolality increase","isCorrect":false},{"label":"D","body":"Both urine volume and urine osmolality decrease","isCorrect":false},{"label":"E","body":"Neither changes in any situation","isCorrect":false}],"explanation":"ADH makes the collecting duct more water-permeable, so more water is reabsorbed. This reduces urine volume and concentrates the urine (higher osmolality)."},{"prompt":"Which pairing is most accurate?","options":[{"label":"A","body":"Aldosterone primarily retains water without solute; ADH primarily retains sodium","isCorrect":false},{"label":"B","body":"Aldosterone primarily increases Na+ reabsorption; ADH primarily increases water reabsorption","isCorrect":true},{"label":"C","body":"Both primarily increase K+ retention","isCorrect":false},{"label":"D","body":"Both directly increase glucose reabsorption","isCorrect":false},{"label":"E","body":"ADH is a steroid; aldosterone is a peptide hormone","isCorrect":false}],"explanation":"Aldosterone increases Na+ reabsorption (and K+ secretion). ADH primarily increases water reabsorption by increasing water permeability of the collecting duct."},{"prompt":"Which statement best explains why the body benefits from having both RAAS and ADH systems?","options":[{"label":"A","body":"RAAS regulates body temperature; ADH regulates red blood cell count","isCorrect":false},{"label":"B","body":"RAAS mainly defends extracellular volume/blood pressure via Na+ retention and vasoconstriction; ADH mainly defends plasma osmolality via water retention","isCorrect":true},{"label":"C","body":"They do the exact same job; two systems exist only by accident","isCorrect":false},{"label":"D","body":"RAAS works only in embryos; ADH works only in adults","isCorrect":false},{"label":"E","body":"ADH is used only for digestion; RAAS only for vision","isCorrect":false}],"explanation":"Volume (pressure) and osmolality are related but not identical problems. RAAS prioritizes restoring effective circulating volume/pressure, while ADH is specialized for controlling water balance and plasma osmolality."},{"prompt":"After heavy sweating with no water intake (sweat is hypotonic compared with plasma), which change is most likely?","options":[{"label":"A","body":"Renin decreases and ADH decreases","isCorrect":false},{"label":"B","body":"Renin increases and ADH increases","isCorrect":true},{"label":"C","body":"Renin increases and ADH decreases","isCorrect":false},{"label":"D","body":"Renin decreases and ADH increases","isCorrect":false},{"label":"E","body":"Neither renin nor ADH changes","isCorrect":false}],"explanation":"Sweating removes proportionally more water than salt, raising plasma osmolality and lowering volume. Higher osmolality stimulates ADH; reduced volume/pressure stimulates RAAS (renin)."},{"prompt":"A person loses a large volume of blood quickly. Plasma osmolality initially stays near normal. Which response is most likely in the first minutes?","options":[{"label":"A","body":"ADH decreases because osmolality is unchanged","isCorrect":false},{"label":"B","body":"Both RAAS and ADH increase because low effective circulating volume activates baroreceptor pathways","isCorrect":true},{"label":"C","body":"Only aldosterone rises immediately within seconds; renin does not change","isCorrect":false},{"label":"D","body":"Renin decreases because blood volume decreased","isCorrect":false},{"label":"E","body":"The kidney increases urine output to replace lost blood","isCorrect":false}],"explanation":"Severe volume/pressure loss strongly activates sympathetic and baroreceptor pathways: renin rises and ADH can rise even if osmolality hasn’t increased (volume defense can override osmolality signals in emergencies)."},{"prompt":"After rapidly drinking several liters of water, which hormone pattern is most expected?","options":[{"label":"A","body":"ADH increases; renin increases","isCorrect":false},{"label":"B","body":"ADH decreases; renin decreases","isCorrect":true},{"label":"C","body":"ADH decreases; renin increases","isCorrect":false},{"label":"D","body":"ADH increases; renin decreases","isCorrect":false},{"label":"E","body":"Both remain unchanged because kidneys do not respond to water intake","isCorrect":false}],"explanation":"A water load lowers plasma osmolality and increases volume, both of which reduce ADH release. Increased volume/pressure also suppresses renin (less need to retain Na+ and water)."},{"prompt":"A patient receives a hypertonic saline infusion (saltier than plasma). Immediately after, which hormone pattern is most likely?","options":[{"label":"A","body":"ADH increases; renin increases","isCorrect":false},{"label":"B","body":"ADH increases; renin decreases","isCorrect":true},{"label":"C","body":"ADH decreases; renin increases","isCorrect":false},{"label":"D","body":"ADH decreases; renin decreases","isCorrect":false},{"label":"E","body":"Neither changes because saline is not a hormone","isCorrect":false}],"explanation":"Hypertonic saline raises plasma osmolality, strongly stimulating ADH. It also expands extracellular volume, which suppresses renin/RAAS."},{"prompt":"Infusion of isotonic saline (same osmolality as plasma) would most likely cause:","options":[{"label":"A","body":"Renin increases; ADH increases","isCorrect":false},{"label":"B","body":"Renin decreases; ADH decreases","isCorrect":true},{"label":"C","body":"Renin increases; ADH decreases","isCorrect":false},{"label":"D","body":"Renin decreases; ADH increases","isCorrect":false},{"label":"E","body":"Renin unchanged; ADH unchanged","isCorrect":false}],"explanation":"Isotonic saline mainly expands volume without changing osmolality much. Increased volume suppresses renin and also reduces ADH (baroreceptor input supports lower ADH when volume is high)."},{"prompt":"Renin is released from specialized cells in the wall of the:","options":[{"label":"A","body":"Efferent arteriole","isCorrect":false},{"label":"B","body":"Afferent arteriole (juxtaglomerular cells)","isCorrect":true},{"label":"C","body":"Glomerular capillaries","isCorrect":false},{"label":"D","body":"Proximal tubule","isCorrect":false},{"label":"E","body":"Collecting duct","isCorrect":false}],"explanation":"Juxtaglomerular (JG) cells are modified smooth muscle cells located in the afferent arteriole near the glomerulus. They secrete renin when renal perfusion is low."}]}"
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