What Is Thought to Cause the 1 Ms Inactive Time

question 32

Multiple Choice

What is thought to cause the 1 ms inactive time after a sodium channel initiates an action potential?

• A)a higher positive charge
• B)a higher negative charge
• C)the presence of an inactivating peptide in the opening of the channel pore
• D)removal of a peptide from the channel protein
• E)covalent addition of a peptide to the cytoplasmic end of the channel protein

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Definitions:

Glutamate

An amino acid that functions as the major excitatory neurotransmitter in the vertebrate brain

All-Or-None Response

The principle that no variation exists in the strength of a single action potential; only a stimulus strong enough to depolarize the membrane to its critical threshold level results in transmission of an action potential.

Depolarized

A state in which the membrane potential of a neuron is less negative compared to the resting potential, easing the initiation of an action potential.

THC

Tetrahydrocannabinol, the principal psychoactive constituent of cannabis that affects the brain and alters mood or consciousness.