Bio Quiz

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  • Published : October 25, 2012
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* Question 1
1 out of 1 points
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 | Alcohol consumption increases urinary output because alcohol ______.Answer| | | | | Selected Answer:|    inhibits ADH (vasopressin) production and release| Response Feedback:| Correct. Alcohol can disturb water balance by inhibiting the release of ADH.|

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* Question 2
1 out of 1 points
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 | What conditions are responsible for the stimulation of the JGA (juxtaglomerular apparatus)?Answer| | | | | Selected Answer:|    a decrease in the blood pressure or blood volume in the afferent arteriole| Response Feedback:| Correct. JGA activation results in the release of renin, which converts angiotensinogen to its active form. Angiotensin II then increases blood pressure by vasoconstriction and increased sodium reabsorption.|

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* Question 3
1 out of 1 points
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 | What is the function of the ascending loop of Henle?Answer| | | | | Selected Answer:|    It helps maintain the concentration gradient of NaCl in the interstitial fluid, thus increasing water reabsorption.| Response Feedback:| Correct. NaCl diffuses out of the ascending loop of Henle in the inner medulla and is actively transported out in the outer medulla.|

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* Question 4
1 out of 1 points
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 | In our bodies, the primary nitrogen-containing compound excreted by our kidneys is ______.Answer| | | | | Selected Answer:|    urea|
Response Feedback:| Correct. Mammals, most adult amphibians, and aquatic turtles excrete urea.|
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* Question 5
1 out of 1 points
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 | Which of the following substances is generally NOT found in the filtrate? Answer| | | | | Selected Answer:|    proteins|
Response Feedback:| Correct. All of these substances are generally filtered from the blood by the kidneys.|
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* Question 6
1 out of 1 points
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 | Processing of filtrate in the proximal and distal tubules accomplishes what important function?Answer| | | | | Selected Answer:|    maintaining a constant pH in body fluids|
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* Question 7
1 out of 1 points
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 | What is the function of antidiuretic hormone (ADH)?Answer| | | | | Selected Answer:|    ADH causes more water to be reabsorbed from the nephrons to be reabsorbed by the blood.| Response Feedback:| Correct. ADH signals the nephrons to release more water from the filtrate into the interstitial fluid; the water is then reabsorbed into the blood.|

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* Question 8
1 out of 1 points
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 | Which one of the following is a tube that carries urine from the kidneys to the urinary bladder in a mammal?Answer| | | | | Selected Answer:|    ureter|
Response Feedback:| Correct. Urine is conveyed to the urinary bladder via the ureter and to the outside of the body via the urethra.|
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* Question 9
1 out of 1 points
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 | The filtrate formed by the nephrons in the kidney is not urine. The filtrate is first refined and concentrated by the processes of _____, which form the urine that leaves the body.Answer| | | | | Selected Answer:|    reabsorption and secretion|

Response Feedback:| Correct. Reabsorption returns valuable molecules filtered from the plasma, while secretion permits selected substances, such as salts and hydrogen ions, to be removed more rapidly from the blood than by filtration alone.|

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* Question 10
1 out of 1 points
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 | Secretion of ADH (antidiuretic hormone) from the ______ occurs in response to _____ and causes ______.Answer| | | | | Selected Answer:|    pituitary gland; high blood osmolarity; increased permeability to water of a collecting duct| Response Feedback:| Correct. When excessive water loss causes an increase in blood osmolarity, antidiuretic hormone, released by the pituitary, acts on the collecting duct to increase the reabsorption of water.|

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