Will ions, for example potassium (K+), freely cross the membrane? a. Yes b. No c

Question

Will ions, for example potassium (K+), freely cross the membrane? a. Yes b. No c. Maybe In deciding whether or not an adrenal tumor is the likely cause for elevated cortisol (a lipid based hormone), you might look for which of the following in the light microscope? a. Increased numbers of mitochondria b. Cells with lots of smooth E.R c. Cells with lots of rough E.R. d. Cells with lots of Golgi apparatus e. Flagellated cells. When concentrations of ions change from rest the membrane potential can change. Three terms are associated with this: depolarization, repolarization and hyperpolarization. What aspects of the graph (A, B, C) represent each (-70mv is rest)? What would happen to the membrane if it became more permeable to Na^+, for example due to opening of ligand- or voltage-gated Na^+ channels? a. Membrane would not change b. Membrane would depolarize c. Membrane would hyperpolarize

Explanation / Answer

5C maybe

6 Cells with lots of rough endoplasmic reticulum

8 membrane would depolarize

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