Exam 13: A: Nervous System Cells

Carbon monoxide (CO)is the only neurotransmitter that is a gas rather than a liquid.

Nerves are usually made up of a single large neuron.

Neurons are the only living cells that maintain a difference in the concentration of ions across their membranes.

The receptors embedded in the plasma membrane of a postsynaptic neuron are protein molecules.

When a neuron is resting,the inner surface of its plasma membrane is slightly positive compared with its outer surface.

The epineurium is deep to the perineurium.

If a motor neuron is damaged,it can cause the muscle it innervates to atrophy because of lack of stimulation.

Damage to a single neuron can have a "domino" effect causing the shutdown of an entire nerve pathway.

Whether an impulse is continued through the neuron depends on the magnitude of the voltage in the axon hillock.

Chemical synapses involve neurotransmitters.

The speed of a nerve impulse depends on the neuron's resting potential.

Three structures make up a synapse: a synaptic knob,a synaptic cleft,and the plasma membrane of the postsynaptic neuron.

The words nerve and neuron mean the same thing.

The sensory fibers from the skin generally conduct impulses up to about 130 meters per second.

A resting neuron has a positive internal charge.

The endoneurium is deep to the epineurium.

The depolarization of a neuron is caused by the influx of the positively charged sodium ion into the cell.

Some neurotransmitters can be transported back to the synaptic knob and be reused by the neuron.

Many biologists believe that amino acids are among the most common neurotransmitters in the CNS.

The opening of stimulus-gated channels is always followed by the opening of voltage-gated channels.