At Rest

question 134

Multiple Choice

At rest,

• A) a neuron has a membrane potential of about -70 mV.
• B) the electrical charge outside the neuron is 70 mV less than inside the neuron.
• C) a neuron is polarized.
• D) all of the above
• E) both A and C

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Definitions:

Adenosine Receptor Sites

Specific cellular locations where adenosine can bind, influencing various physiological processes.

Caffeine

A stimulant found in coffee, tea, chocolate, and some medications, known for its effects on increasing alertness and reducing fatigue.

Excitatory Neurotransmitters

Chemical substances released by neurons to transmit signals across synapses, promoting the firing of action potentials in receiving neurons, thus facilitating brain and nervous system activity.

Nervous System

is the network of nerve cells and fibers that transmits nerve impulses between parts of the body, coordinating its actions and sensory information.