Biology Questions "Urgent"Please !

Lometa
Thu, 25 Apr 2013 20:45:11 +0000

Please answer and Tell Me why if U’ want

1.All of the following facilitate the return of venous blood the heart in mammals EXCEPT
(A) reclining or lying flat on the floor
(B) contracting skeletal muscles
(C) contracting the diaphragm during breathing
(D) voluntarily contracting the veins
(E) having one-way valves in veins

2.One effect of increasing the concentration of antiduretic hormone (ADH)is to :
(A)Reduce the permeability to water in the loop of henle.
(B)reduce the permeability to water of the collecting ducts
(C)reduce blood volume
(D)increase the volume and output of urine
(E)increase the concentration and decrease the volume of urine

3.Coffee contains caffeine, which inhibits the secretion of antiduretic hormone (ADH).after coffee is consumed .the kidney produces
(A)a larger than normal volume of concentrated urine
(B)a larger than normal volume of dilute urine
(C) a smaller than normal volume of dilute urine
(D)salts to replace those that were eliminated
(E)diuretic hormone (ADH)to counteract the effect of caffeine.