Muscle cell contraction is facilitated by a small electrical current. Which types of molecules are likely involved?
A. Isotopes
B. Electrolytes
C. Gasses
D. Free radicals
E. Vitamins
Answer: B
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The dural sinuses are found between the ____________________.
Fill in the blank(s) with the appropriate word(s).
Motor neurons and interneurons are ______________ neurons.
A) unipolar B) bipolar C) multipolar D) afferent
Potassium ions are attracted toward a more positively charged area along an electrical gradient, while chloride ions are attracted toward a more negatively charged area
Indicate whether the statement is true or false
Which of the following correctly describes water movement across the epithelial cells lining the collecting duct?
A) Water can permeate the lipid bilayer at all times. B) Water can permeate the phospholipid bilayer only in the presence of aldosterone. C) Water can permeate the apical membrane through aquaporin-2 and the basolateral membrane through aquaporin-3, but aquaporin-2 is only present in the presence of ADH. D) Water can permeate the basolateral membrane through aquaporin-2 and the apical membrane through aquaporin-3, but aquaporin-2 is only present in the presence of aldosterone. E) Water can permeate the phospholipid bilayer only in the presence of ADH.