Examlex
Which of the following best defines consciousness?
Membrane Receptor
A specialized protein molecule embedded in the cell membrane that can interact with specific molecules, starting a chain of cell responses.
Depolarization
The process in which a cell's membrane potential becomes less negative, moving towards zero, which is critical in the initiation of action potentials.
Threshold Stimulus
Stimulus resulting in a local potential just large enough to reach threshold and produce an action potential.
All-Or-None Contraction
A principle stating that a nerve or muscle fiber responds completely or not at all to a stimulus once the stimulus reaches a threshold value.
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