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RENAL PHYSIOLOGY: KIDNEY STRUCTURE, FUNCTION, AND REGULATION, Exams of Physiology

Stanford UniversityPhysiology

What is the primary function of the renal system in homeostasis? - answer- To maintain proper osmolarity and tonicity in the extracellular fluid (ECF). What is the normal osmolarity of the extracellular fluid? - answer- 300 mOsm/L What are the primary organs of the urinary system? - answer- The kidneys, specifically the nephrons. What are the main regions of a kidney? - answer- Renal cortex and renal medulla. What is the functional unit of the kidney? - answer- The nephron. What are the components of the nephron tubules? - answer- Bowman's Capsule, Proximal Convoluted Tubule, Loop of Henle, Distal Convoluted Tubule, and Collecting Duct

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2025/2026

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RENAL PHYSIOLOGY: KIDNEY STRUCTURE,
FUNCTION, AND REGULATION |VERIFIED
QUESTIONS AND ANSWERS
What is the primary function of the renal system in homeostasis? - answer- To maintain proper
osmolarity and tonicity in the extracellular fluid (ECF).
What is the normal osmolarity of the extracellular fluid? - answer- 300 mOsm/L
What are the primary organs of the urinary system? - answer- The kidneys, specifically the
nephrons.
What are the main regions of a kidney? - answer- Renal cortex and renal medulla.
What is the functional unit of the kidney? - answer- The nephron.
What are the components of the nephron tubules? - answer- Bowman's Capsule, Proximal
Convoluted Tubule, Loop of Henle, Distal Convoluted Tubule, and Collecting Duct.
What is the blood supply arrangement in the nephron? - answer- Renal artery, afferent arteriole,
glomerular capillaries, efferent arteriole, peritubular capillaries, and renal vein.
What is the juxtaglomerular apparatus (JGA)? - answer- A structure composed of
juxtaglomerular cells and macula densa that regulates blood pressure and filtration.
What is the role of juxtaglomerular cells? - answer- They sense low pressure and release renin.
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RENAL PHYSIOLOGY: KIDNEY STRUCTURE,

FUNCTION, AND REGULATION |VERIFIED

QUESTIONS AND ANSWERS

What is the primary function of the renal system in homeostasis? - answer- To maintain proper osmolarity and tonicity in the extracellular fluid (ECF). What is the normal osmolarity of the extracellular fluid? - answer- 300 mOsm/L What are the primary organs of the urinary system? - answer- The kidneys, specifically the nephrons. What are the main regions of a kidney? - answer- Renal cortex and renal medulla. What is the functional unit of the kidney? - answer- The nephron. What are the components of the nephron tubules? - answer- Bowman's Capsule, Proximal Convoluted Tubule, Loop of Henle, Distal Convoluted Tubule, and Collecting Duct. What is the blood supply arrangement in the nephron? - answer- Renal artery, afferent arteriole, glomerular capillaries, efferent arteriole, peritubular capillaries, and renal vein. What is the juxtaglomerular apparatus (JGA)? - answer- A structure composed of juxtaglomerular cells and macula densa that regulates blood pressure and filtration. What is the role of juxtaglomerular cells? - answer- They sense low pressure and release renin.

What is the function of the macula densa? - answer- It senses sodium and chloride flow and sends signals to the afferent arterioles. What are the three basic renal processes? - answer- Glomerular filtration, tubular reabsorption, and tubular secretion. What percentage of plasma is filtered in glomerular filtration? - answer- 20% of plasma. What is the glomerular filtration rate (GFR)? - answer- 125 ml/min or 180 L/day. What is the difference between secretion and excretion? - answer- Secretion is the process of moving substances from blood into the tubules, while excretion is the removal of substances in urine. What are the barriers to filtration in the renal corpuscle? - answer- Capillary endothelium, basement membrane, and Bowman's epithelium (podocytes). What is the significance of the negative charge of the basement membrane? - answer- It helps exclude plasma proteins from filtration. What is renal plasma clearance? - answer- The volume of plasma from which a substance is completely removed by the kidneys per unit time. What is the equation for renal plasma clearance? - answer- C = (Ux × V) / Px, where Ux is the urine concentration, V is the urine flow rate, and Px is the plasma concentration. What is the role of the proximal tubule in tubular reabsorption? - answer- It reabsorbs a large volume of water, ions, and nutrients from the filtrate.

What does it indicate if RPC > GFR? - answer- The substance is NET secreted. What does it indicate if RPC < GFR? - answer- The substance is NET reabsorbed (or partially filtered). What is the renal plasma clearance of creatinine used for? - answer- It is a practical way to determine GFR. What is the normal renal plasma flow (RPF)? - answer- 625 ml/min What is the micturition reflex? - answer- A cycle involving pressure increase, sustained pressure, and return to basal tone. Where does 65% of Na+ reabsorption occur? - answer- In the proximal tubule, and it is non- regulated. What regulates Na+ reabsorption in the distal tubule? - answer- Hormones, specifically aldosterone. What is the role of aldosterone in the kidneys? - answer- It builds Na+ channels and Na+/K+ ATPases. What is the primary route for water reabsorption in the proximal tubule? - answer- Paracellular route via leaky tight junctions. What is the primary route for water reabsorption in the distal tubule? - answer- Transcellular route requiring aquaporins, regulated by ADH.

What is the countercurrent multiplier system? - answer- A mechanism that establishes a renal medullary gradient for urine concentration. What is the effect of ADH on urine concentration? - answer- It allows for the excretion of a low volume of highly concentrated urine. What happens to the osmolarity of filtrate as it flows past the macula densa during dehydration? - answer- It increases, potentially reaching values like 600 mOsm/L or higher. What is the renal response to sweating? - answer- The kidneys conserve water and NaCl to maintain blood volume and osmolarity. What is the excreted load of a substance? - answer- The amount of substance excreted in urine per minute. What is the renal plasma clearance for creatinine? - answer- Approximately equal to true GFR, typically around 125 mL/min. What is the interpretation of a substance that is freely filtered and then net secreted? - answer- It indicates that the substance is actively removed from the blood into the urine. What is the role of caffeine on renal function? - answer- It dilates afferent arterioles, potentially increasing renal blood flow. What is the effect of alcohol on ADH secretion? - answer- It inhibits ADH secretion, leading to increased urine output. What are the four types of acid-base disorders? - answer- Respiratory alkalosis, respiratory acidosis, metabolic alkalosis, and metabolic acidosis.