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. 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. 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. 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. 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