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75)C hanges that occur in the urinary system with aging include all of the following,except75)A )problems w ith the micturition reflex.B)a decline in the number of functional nephrons.C )a reduction in the GFR (glomerular fltration rate).D )loss of sphincter muscle tonus.E)increased sensitivity to A D H.A nsw er:EESSAY. Write your answer in the space provided or on a separate sheet of paper.76)List each organ of the urinary system and concisely describe its function.A nsw er:Consisting of the kidneys, ureters, urinary bladder, and urethra, the urinary system has thfunctions: (1) excretion, the removal of organic waste products from body fluids, (2) elimindischarge of these waste products into the environment, and (3) homeostatic regulation ofand solute concentration of blood plasma. The excretory and homeostatic regulation functurinary system are performed by the two kidneys that produce urine, a fluid containing wasmall soluble compounds. Urine lea ving the kidneys flows along paired tubes called ureterurinary blad der, a muscular sac for temporary storage of urine. On being forced out of thebladder, urine passes through the urethra to the exterior. T he urinary bladder and the ureresponsible for the elimination of urine, a process called urination ormicturition.MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question77)A pproximately ________ liters of glomerular fltrate enter glomerular capsules each day.77)A nsw er:B78)The cells of the macula densa and the juxtaglomerular cells form the78)A nsw er:D79)The prominent indentation on the medial surface of the kidney is the79)A nsw er:E19
80)W hich of the follow ing isnotan important function of the kidney?80)A )regulation of blood pressureB)control of production of red blood cells by bone marrowC )excretion of excess albumenD )control of the electrolyte composition of the bloodE)control of total body waterA nsw er:CSHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.81)In the process of ________ two substances are moved across a cell membrane in the samedirection without directly using cellular energy. One of the substances can be movedagainst a concentration gradient by this process.81)A nsw er:cotr ansport20
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the questionFigure 26-2 The NephronUse Figure 26-2 to answer the following questions:82)W hat physiological process occurs at the structure labeled "1"?82)A nsw er:C