Question 1
An ion widely important in intracellular signaling is
◦ sodium.
◦ potassium.
◦ cobalt.
◦ calcium.
◦ chloride.
Question 2
When calcium becomes available inside a cell, it comes from
◦ intracellular storage.
◦ extracellular fluid.
◦ A and B.
◦ It is always available as a major cytosol cation.