91. By the time filtrate reaches the tip of the : 1380631

91. By the time filtrate reaches the tip of the : 1380631.


91.  By the time filtrate reaches the tip of the loop of Henle, _____ of the filtrate volume has been reabsorbed.  
A.  65%
B.  75%
C.  80%
D.  95%
E.  100%

92.  The filtrate that drips from the renal papillae into the calyces  
A.  has a higher concentration of waste products (urea) than the original filtrate.
B.  may have lost up to 99% of its original volume.
C.  is called urine.
D.  has a higher concentration of waste products (urea) than the original filtrate, may have lost up to 99% of its original waste, and is called urine.
E.  None of these choices is correct.

93.  Filtrate reabsorption, which occurs regardless of the concentration and volume of urine produced, is referred to as  
A.  active.
B.  obligatory.
C.  facultative.
D.  countercurrent.
E.  nonessential.

94. Urine concentration and volume depend on water reabsorption in the 
A. proximal convoluted tubule.
B. descending loop of Henle.
C. ascending loop of Henle.
D. distal convoluted tubule only.
E. distal convoluted tubule and collecting ducts.

95. Some lung cancers secrete large amounts of ADH. This causes increased water reabsorption in the 
A. proximal convoluted tubule.
B. loop of Henle.
C. distal convoluted tubule and collecting ducts.
D. calyces.
E. urethra.

96.  Which of the following situations increases the number of action potentials to the supraoptic region of the hypothalamus?  
A.  increased blood velocity
B.  decreased renin production
C.  increased plasma osmolality
D.  decreased aldosterone secretion
E.  decreased plasma osmolality

97.  Decreased ADH levels results in a urine high in  
A.  potassium.
B.  water content.
C.  glucose content.
D.  bicarbonate content.
E.  hydrogen ions.

98.  Diabetes insipidus is the result of decreased  
A.  ADH production.
B.  insulin production.
C.  aldosterone production.
D.  angiotensin II production.
E.  glucagon production.

99.  Removal of the posterior pituitary will immediately cause  
A.  a decrease in urine volume.
B.  an increase in urine volume.
C.  no change in urine volume.

100.  A 15% increase in blood pressure would result in which of the following changes in ADH secretion?  
A.  increased secretion
B.  decreased secretion
C.  no change in secretion



91. By the time filtrate reaches the tip of the : 1380631

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