Examlex
Hard water in parts of the Midwest may have a calcium ion concentration as high as 400 ppm.What is this calcium ion concentration when expressed as a percentage?
Hyperpolarization
An increase in a cell's membrane potential, making it more negative inside compared to the outside and further from the threshold that causes action potentials.
Absolute Refractory Period
A period immediately following the stimulation during which a nerve or muscle is unresponsive to further stimulation.
Second Messenger System
A method of cellular signaling where the signal from a first messenger is transferred to a secondary molecule inside the cell to elicit a physiological change.
Protein Kinase
An enzyme that modifies other proteins by chemically adding phosphate groups to them, thereby altering their function.
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