Urinary System and Fluid Balance
Name ____________________ Pd_____Date_________
Urine Production
❛❛The three processes critical to the formation of urine are filtration, reabsorption, and secretion.❜❜
Match these terms with the correct statement or definition Filtration, Tubular secretion, Tubular reabsorption
____________________1. Movement of plasma through the filtration membrane of the renal corpuscle.
____________________2. Movement of substances from the filtrate back into the blood of the peritubular capillaries.
____________________3. Transport of substances, usually waste products, into the filtrate.
Using the terms provided, complete these statements:
Blood cells and proteins, Filtration pressure, Bowman’s capsule, Increases, Decreases, Water, Filtration membrane
____________________1. The filtration membrane allows some substances, but not others, to pass from the blood
____________________2. into(1) (2) and small solutes readily pass through the filtration membrane, but (3) do not enter
____________________3.Bowman’s capsule. The formation of filtrate depends on a pressure difference called (4), which
____________________4. forces fluid from the glomerular capillaries, through the (5) into Bowman's capsule. When
____________________5. filtration pressure increases, the volume of the filtrate (6) , and the urine volume (7) . The
____________________6. filtration pressure is influenced by several factors. If the blood pressure in the glomerular
____________________7. capillaries increases, then filtration pressure (8) . Filtration pressure (9) when strong
____________________8. sympathetic stimulation produces constriction of renal blood vessels during excitement,
____________________9. vigorous physical activity, or emergencies. Also, decreases in the concentration of plasma
____________________10.protein (10) the filtration pressure..
Match these parts of the nephron with the correct function or description:
Ascending limb, Distal tubule, Collecting duct, Proximal tubule, Descending limb
____________________1. Sixty-five percent of filtrate is reabsorbed here; proteins, sugars and ions are transported out
of the tubule to the peritubular capillaries, and water follows by osmosis.
____________________2. Functions to concentrate the filtrate by removing water and adding solutes; 15 percent of
filtrate volume is removed.
____________________3. Functions to dilute the filtrate by removing sodium and chloride ions; not permeable to water.
____________________4. Sodium ions and chloride ions are removed from the filtrate, and water follows by osmosis; 19
percent of the filtrate volume is removed, leaving only 1 percent of original volume.
Urine Movement
❛❛The micturition reflex is initiated by stretching of the bladder wall.❜❜
Using the terms provided, complete these statements:
Contract Relax, Higher brain centers Spinal cord, Irritation Stretch receptors, Parasympathetic Sympathetic
____________________1. As the bladder fills with urine, (1) in the wall of the bladder are stimulated. Action potentials
____________________2. travel to the (2) through the pelvic nerves, where integration of the reflex occurs. Action
____________________3. potentials then travel through (3) fibers back to the urinary bladder. Parasympathetic
____________________4. action potentials cause the urinary bladder to (4) and the internal urinary sphincter to (5) . Also
____________________5. because of the micturition reflex, action potentials to the external urinary sphincter decrease,
____________________6. which causes the sphincter to (6) . (7) can prevent or facilitate the micturition reflex by sending
____________________7. action potentials through the spinal cord to influence the intensity of the autonomic reflex and
____________________8. stimulate or inhibit the external urinary sphincter. Stretch of the urinary bladder also sends
____________________9. action potentials through afferent fibers to the brain, causing awareness of the need to urinate.
____________________ 10. (8) of the urinary bladder or urethra can also initiate the urge to urinate.
Regulation of Acid-Base Balance
❛❛The mechanisms that regulate body pH are critical for survival.❜❜
Match these terms with the correct statement or definition:
Bicarbonate buffer system, Protein buffer system, Phosphate buffer system
____________________1. Two that combine with the largest numbers of hydrogen ions.
____________________2. Amino acid side chains function as weak acids or weak bases.
____________________3. Can be regulated by the respiratory and urinary systems.
Urine Movement
❛❛The micturition reflex is initiated by stretching of the bladder wall.❜❜
Using the terms provided, complete these statements:
Contract Relax, Higher brain centers, Spinal cord, Irritation, Stretch receptors, Parasympathetic, Sympathetic
____________________1. As the bladder fills with urine, (1) in the wall of the bladder are stimulated. Action potentials
____________________2. travel to the (2) through the pelvic nerves, where integration of the reflex occurs. Action
____________________3. potentials then travel through (3) fibers back to the urinary bladder. Parasympathetic action
____________________4. potentials cause the urinary bladder to (4) and the internal urinary sphincter to (5) . Also
____________________5. because of the micturition reflex, action potentials to the external urinary sphincter decrease,
____________________6. which causes the sphincter to (6) . (7) can prevent or facilitate the micturition reflex by sending
____________________7. action potentials through the spinal cord to influence the intensity of the autonomic reflex and
____________________8. stimulate or inhibit the external urinary sphincter. Stretch of the urinary bladder also sends
action potentials through afferent fibers to the brain, causing awareness of the need to urinate. (8) of the
urinary bladder or urethra can also initiate the urge to urinate.
Regulation of Urine Concentration and Volume
❛❛The volume and composition of urine changes, depending on conditions in the body.❜❜
Using the terms provided, complete these statements:
Concentrated Increases, Dilute Large, Decreases Small
____________________1. If body fluid concentration increases above normal levels, the kidneys produce a (1) amount of
____________________2. (2) urine, which eliminates solutes and conserves water. This helps to return the body fluid
____________________3. concentration to normal. If body fluid concentration decreases, the kidneys produce a (3)
____________________4. amount of (4) urine. As a result, water is lost and solutes conserved, and body fluid
____________________5. concentration increases. Urine production also maintains blood volume and therefore blood
____________________6. pressure. When blood volume increases above normal, the kidneys produce a (5) amount of
____________________7. (6) urine. The loss of water (7) blood volume and also (8) blood pressure.
Match these terms with the correct statement or definition:
Ascending limb, Glomerulus, Bowman's capsule, Nephron, Collecting duct, Podocytes, Descending limb, Renal corpuscle
Filtration membrane
____________________1. Functional unit of the kidney.
____________________2. Duct into which the distal tubule empties.
____________________3. Enlarged end of nephron; Bowman's capsule and glomerulus.
____________________4. Tuft of capillaries surrounded by Bowman's capsule.
____________________5. Specialized cells that surround the glomerulus and form the inner layer of Bowman's capsule.
____________________6. Composed of glomerular capillary walls, podocytes, and the basement membrane between
them.
____________________7. Part of Henle’s loop; very permeable to water and solutes.
Place these vessels in the correct sequence that blood would pass through them, from abdominal aorta to renal veins.
Arcuate artery, Interlobar artery, Afferent arteriole, Interlobular artery, Efferent arteriole, Peritubular capillaries,
Glomerular capillaries, Renal artery
1. Abdominal aorta
5. ____________________
9. ____________________
2. ____________________
6. ____________________
10. Renal veins
3. ____________________
7. ____________________
4. ____________________
8. ____________________
Urine Production
❛❛The three processes critical to the formation of urine are filtration, reabsorption, and secretion.❜❜
Match these terms with the correct statement or definition:
Filtration, Tubular secretion, Tubular reabsorption
___________________1. Movement of plasma through the filtration membrane of the renal corpuscle.
___________________2. Movement of substances from the filtrate back into the blood of the peritubular capillaries.
___________________3. Transport of substances, usually waste products, into the filtrate.
C. Match these terms with the correct parts labeled in figure 18.1:
Renal calyx, Renal capsule, Renal cortex, Renal medulla, Renal pelvis, Renal pyramid, Ureter
____________________1
____________________2
____________________3
____________________4
____________________5
____________________6
____________________7
Match these terms with the correct parts labeled in figure 18.2:
Collecting duct, Distal tubule, Loop of Henle, Proximal tubule, Renal corpuscle
____________________1
____________________2
____________________3
____________________4
____________________5