Anatomy 6.2 - Transmission of Nerve Impulses

In the resting phase of the axon during an impulse conduction, the outside of the axon has a positive charge while the inside of the axon has a negative charge. this resting state is also called -

• polarized

• insulated

• depolarized

• conductive

When a stimulus approaches the axon, it opens up channels to allow what chemical ion to flow into the axon?

• sodium

• iron

• potassium

• calcium

When the chemical ions enter the axon, the charges flip and the outside now becomes negative and the inside positive. This is known as -

• polarization

• conductivity

• depolarization

• insulation

To return back to the normal resting phase, a channel on the axon membrane opens up and allows what chemical ion to escape from the axon?

• sodium

• calcium

• potassium

• iron

Returning back to the resting phase is called -

• polarization

• conductivity

• depolarization

• repolarization

The time between the completion of the impulse and repolarization is called the -

• polarization

• refractory period

• completion

• impulse delay

The ability of a neuron (axon) to transmit a nerve impulse is called -

• reflexes

• polarization

• depolarization

• conductivity

When the action potential impulse is traveling down the axon and it "jumps over" the myleninated sections of the axon to make the impulse move faster, this is known as -

• impulse momentum

• electric current

• saltatory conduction

• nodes of Ranvier

Which of the following will be the slowest moving nerve impulse?

• an axon covered with mylein sheaths (schwann cells)

• a large diameter axon

• an axon in warmer than normal temperatures

• unmyleinated axons

This type of reflex involves the stimulation of skeletal muscles

• somatic

• parasympathetic

• autonomic

• sympathetic