Chapter 24: The Urinary System – Flashcards

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Which hormones promote facultative water reabsorption?
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Aldosterone and antidiuretic hormone (ADH)
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What initiates the micturition reflex?
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Stretch receptors in the wall of the urinary bladder signal the sacral region of the spinal cord.
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The trigone of the urinary bladder is created by __________.
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the openings to the two urethral orifices and the internal urethral orifice
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The process of filtration occurs at the __________.
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renal corpuscle
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Each of the following is typical of urine except __________. a pH of 3.0 yellow color translucency mild odor
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a pH of 3.0
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Where does blood in the arcuate artery travel next on its journey toward the glomerulus?
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Interlobular (cortical radiate) artery
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How much urine, in liters, is typically produced in a 24-hour period?
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1.8
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Urine is transported from kidney to the urinary bladder by the __________.
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ureter
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What is not a major function of the kidneys? Hematopoiesis Removal of metabolic wastes Regulation of acid-base balance Regulation of blood volume and blood pressure
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hematopoiesis
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The reabsorption of bicarbonate ions in the proximal tubule helps regulate __________.
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blood pH
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The portion of the renal tubule through which filtrate initially flows is known as the __________.
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proximal tubule
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The functional units of the kidneys are __________.
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nephrons
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Renal clearance is defined as __________.
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the rate at which the kidneys remove a substance from the blood
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What are the two main subdivisions of the nephron?
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Renal corpuscle and renal tubule
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What is not a major function of the kidneys?
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Hematopoiesis
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What is net filtration pressure (NFP) in the glomerular capillaries, in mm Hg?
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10
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Which of the following is an effect of angiotensin-II (A-II)?
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A-II promotes thirst.
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What should not be found in filtrate? Electrolytes Albumin Glucose Water
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Albumin
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What is the normal value for the glomerular filtration rate (GFR) in mL/min?
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125
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The myogenic mechanism acts to restore glomerular filtration rate (GFR) by changing __________.
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vessel diameter
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What does the countercurrent mechanism accomplish in the nephron loop?
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Creation of a steep concentration gradient for continued water reabsorption
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Which statement best describes the function of tubular reabsorption?
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Tubular reabsorption reclaims items from filtrate and returns them to the blood.
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Urine drains from a major calyx into __________.
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the renal pelvis
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Glomerular colloid osmotic pressure (GCOP) is created by __________.
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proteins such as albumin in the blood
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In which kidney region are the renal pyramids located?
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Renal medulla
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Sympathetic stimulation of the kidney can do all of the following, except __________.
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increase the glomerular filtration rate (GFR)
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Which of the following is NOT a component of the urinary tract? urinary bladder kidneys ureters urethra
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kidneys
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The arteriole that delivers blood to the glomerulus is the __________.
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afferent arteriole
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Returning fluid and solutes from filtrate to blood happens via __________.
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tubular reabsorption
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Filtration happens at the:
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glomerulus
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Which of the following is NOT a component of the filtration membrane? epithelial cells of the glomerular capsule fenestrated glomerular capillaries basal lamina podocyte filtration slits
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epithelial cells of the glomerular capsule
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Which of the following solutes are not able to pass through the filtration membrane in a healthy kidney?
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albumin
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Which of the following forces drives filtration?
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Glomerular hydrostatic pressure (GHP)
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The Net Filtration Pressure (NFP) is equal to:
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GHP - (GCOP + CHP)
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A decrease in GFR will cause __________.
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lower Na and Cl ion concentration in the distal tubule
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Which of the following will NOT pass across the filtration membrane? urea electrolytes glucose plasma proteins
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plasma proteins
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The amount of filtrate formed by both kidneys in 1 minute is defined as the __________.
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GFR
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The hormone ANP causes an __________.
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increase in GFR
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Which of the following substances is not normally found in filtrate?
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blood cells and large particles
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What is the primary driving force (pressure) that produces glomerular filtration?
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hydrostatic pressure of blood (blood pressure)
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Which substance would be found in higher concentration if the membrane were damaged?
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protein
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If the osmotic pressure in the glomerular capillaries increased from 28 mm Hg to 35 mm Hg, would net filtration increase or decrease?
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net filtration would decrease
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Calculate the net filtration pressure if capillary hydrostatic pressure is 60 mm Hg, capillary osmotic pressure is 25 mm Hg, and capsular hydrostatic pressure is 10 mm Hg.
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25 mm Hg
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Aldosterone antagonist drugs prevent aldosterone from having an effect at its receptors. As a result __________.
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more urine will be produced
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Most nutrients, such as glucose, are reabsorbed in the __________.
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proximal tubule
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Consuming alcohol inhibits the release of ADH. As a result __________.
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urine volume will increase
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The filtrate is most concentrated __________.
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at the turn of the nephron loop
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The thin descending limb of the nephron loop is permeable to __________.
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water
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Increased water reabsorption in the descending limb of the nephron loop will result in __________.
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increased NaCl reabsorption in the ascending limb
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Which of the following is a normal property of urine?
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translucent
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Which of the following substances is used to measure renal clearance?
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inulin
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The mucosa of the bladder __________.
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contains rugae
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The micturition reflex is initiated by __________.
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stretch receptors in the wall of the bladder
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Which of the following is controlled voluntarily? urine production by the kidneys opening of the internal urethral sphincter opening of the external urethral sphincter peristalsis in ureters
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opening of the external urethral sphincter
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The detrusor muscle __________.
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compresses the urinary bladder and expels urine
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