Immediately after an action potential has peaked, which cellular gates open?
A) sodium
B) chloride
C) calcium
D) potassium
D) potassium
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Which of the following is the correct sequence of events in bulk-phase endocytosis shown in the figure?
a) plasma membrane forms vesicle around extracellular droplets > fusion of lysosome and vesicle > vesicle formed pinches off into cytosol > digestion by enzymes > solutes released b) solutes released > plasma membrane forms vesicle around extracellular droplets > fusion of lysosome and vesicle > vesicle formed pinches off into cytosol > digestion by enzymes c) vesicle formed pinches off into cytosol > solutes released > plasma membrane forms vesicle around extracellular droplets > fusion of lysosome and vesicle > digestion by enzymes d) vesicle formed pinches off into cytosol > plasma membrane forms vesicle around extracellular droplets > fusion of lysosome and vesicle > digestion by enzymes > solutes released e) plasma membrane forms vesicle around extracellular droplets > vesicle formed pinches off into cytosol > fusion of lysosome and vesicle > digestion by enzymes > solutes released
Mucin _______ the viscosity of mucus, facilitating the ______ of dust and dirt particles
A. increases; trapping B. decreases; flushing C. increases; diluting D. decreases; exocytosis
The fluid passing through the tip of the loop of Henle is ____________________ relative to normal body fluids
Fill in the blank(s) with correct word
How do hormones and target cells recognize one another?
A. By the location of the target cells B. By signs C. By the location of the hormones D. By the presence of specific receptor molecules on or in the target cells E. By the function of the target cells