What do thyroid follicular calls secrete?
a) calcitonin
b) parathyroid hormone
c) thymosin
d) thyroxine
Ans: d) thyroxine
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The "dark current" of photoreceptors refers to
A. the exit of Na+ and Ca2+ out of the cell when light is not hitting the cell. B. the entry of Na+ and Ca2+ into the cell when light is not hitting the cell. C. the entry of K+ into the cell when light is not hitting the cell. D. the exit of K+ out of the cell when light is not hitting the cell.
Describe the negative feedback loop that controls the rate of erythropoiesis. Under what circumstances would you expect the rate of erythropoiesis to increase? How would it be possible to tell if the rate of erythropoiesis is elevated?
What will be an ideal response
What type of proteins are present at chemical synapses to ensure the close proximity of the presynaptic and postsynaptic membranes?
What will be an ideal response?
What is the [H+] in pure water?
A) 1X10-7 mol/L B) 1X10-14 mol/L C) 7 mol/L D) 1X107 mol/L E) 1X1014 mol/L