Human Physiology: Urine Production Processes
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Questions and Answers

What is the primary function of glomerular filtration in the production of urine?

  • Movement of molecules from plasma in glomerulus into capsular space (correct)
  • Movement of molecules out of peritubular blood and into tubules
  • Excretion of unwanted substances from tubules into peritubular blood
  • Reabsorption of molecules from tubules into peritubular blood

In which part of the kidney does tubular reabsorption primarily occur to put substances back into the blood?

  • Peritubular blood
  • Efferent arteriole
  • Renal corpuscle
  • Tubules (correct)

What is the main purpose of tubular secretion in the urine production process?

  • Excreting unwanted substances by moving them from blood into tubules (correct)
  • Moving molecules out of peritubular blood into tubules for reabsorption
  • Filtering substances exclusively in renal corpuscle across capillary wall
  • Transporting substances from plasma in glomerulus into capsular space

What is the main driving force behind glomerular filtration?

<p>Pressure gradient between blood and the filtrate in capsular space (B)</p> Signup and view all the answers

Why does pressure build up in the capillaries during glomerular filtration?

<p>From wider efferent arteriole limiting blood flow out of the capillaries (A)</p> Signup and view all the answers

Which statement accurately describes a key aspect of filtration membrane functioning?

<p>Substances small enough to cross membrane will do so to collect in capsular space (A)</p> Signup and view all the answers

What is the force of fluid on the walls of its container that pushes fluid out called?

<p>Hydrostatic pressure (D)</p> Signup and view all the answers

Which pressure is created by proteins or solutes in the environment that pulls fluid into the environment?

<p>Colloid osmotic pressure (D)</p> Signup and view all the answers

Which pressure force is directly correlated with the body's systemic blood pressure?

<p>Glomerular hydrostatic pressure (GHP) (C)</p> Signup and view all the answers

What happens if Capsular colloid osmotic pressure (CCOP) increases?

<p>Increase in Glomerular filtration rate (GFR) (B)</p> Signup and view all the answers

Which mechanism triggers smooth muscle contraction in afferent arterioles resulting in a decrease in blood flow and GFR when blood pressure increases?

<p>Myogenic mechanism (C)</p> Signup and view all the answers

What is the formula for Effective Filtration Pressure (EFP)?

<p>(GHP - CCOP) - (GCOP + CHP) (C)</p> Signup and view all the answers

Which of the following pressures favors filtration when it is greater than the sum of opposing forces?

<p>Glomerular hydrostatic pressure (GHP) (A)</p> Signup and view all the answers

What happens to Glomerular Filtration Rate (GFR) if Afferent arteriole diameter decreases?

<p>It decreases (D)</p> Signup and view all the answers

Which of these directly impacts Glomerular Filtration Rate (GFR)?

<p>Renal failure (A)</p> Signup and view all the answers

What is the effect of an increase in Systemic blood pressure on Glomerular Filtration Rate (GFR)?

<p>Increase in GFR (C)</p> Signup and view all the answers

What is the main function of the macula densa cells in the tubuloglomerular feedback system?

<p>Act as chemoreceptors to determine solute levels in the distal convoluted tubule (C)</p> Signup and view all the answers

Which of the following is NOT a function of juxtaglomerular cells in the tubuloglomerular feedback system?

<p>Stimulate the secretion of erythropoietin (C)</p> Signup and view all the answers

What is the purpose of the Renin-Angiotensin-Aldosterone System (RAAS) in the context of tubuloglomerular feedback?

<p>To increase blood volume and pressure when GFR is too low (B)</p> Signup and view all the answers

Which enzyme is responsible for converting angiotensin I to angiotensin II in the Renin-Angiotensin-Aldosterone System (RAAS)?

<p>Angiotensin converting enzyme (ACE) (A)</p> Signup and view all the answers

What is the primary action of ACE inhibitors in treating high blood pressure?

<p>Block the production of angiotensin II (D)</p> Signup and view all the answers

Glucosuria occurs when blood glucose levels exceed what amount?

<p>$200$ mg/ml (A)</p> Signup and view all the answers

What is the consequence of excessive glucose in the filtrate in terms of water reabsorption?

<p>Inhibits water reabsorption (C)</p> Signup and view all the answers

What is the main function of the distal convoluted tubule?

<p>Reabsorption of Na, K, and Cl (C)</p> Signup and view all the answers

Which hormone increases reabsorption of sodium and secretion of potassium in the kidneys?

<p>Aldosterone (C)</p> Signup and view all the answers

In the process of tubular secretion, what happens when blood pH decreases?

<p>Secretion of bicarbonate ions increases (B)</p> Signup and view all the answers

What is the role of the countercurrent multiplier system in the kidney?

<p>Creating and maintaining medullary osmotic gradient (C)</p> Signup and view all the answers

What occurs in the recycling of urea within the medullary collecting system?

<p>Urea passively diffuses out of the filtrate (B)</p> Signup and view all the answers

What is the main function of the countercurrent exchanger in the kidney?

<p>Delivery of O2 and nutrients to medulla (C)</p> Signup and view all the answers

How is renal clearance defined?

<p>Rate at which kidneys remove a substance from blood (A)</p> Signup and view all the answers

What occurs when volume exceeds 500mL during micturition?

<p>Reflexive relaxation of internal urethral sphincter (A)</p> Signup and view all the answers

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