A & P Chapter 6 Review Part 2

As the Na+ ions outside the cell rapidly diffuse into the neuron. This changes the electrical charge inside the cell to become more positive & the neuron membrane is depolarized.

• true

• false

The _______of the neuron membrane opens more gated ion channels along the membrane, generating a wave of depolarization through the neuron.

• repolarization

• polarization

• conduction

• depolarization

The  time between completion of the action potential & ______ is called the refractory period; the neuron is temporarily “fatigued.”

• depolarization

• repolarization

• hyperpoarization

• polarization

Depolarization occurs only at the node of Ranvier.

• true

• false

The impacts on the speed of which a nerve impulse travels includes all of the following except:

• Body temperature

• The diameter of the axon

• the type of neuroin

• presence or absence of a myelin sheath..

Impulse conduction is faster in nonmyelinated axons with larger diameters than those with smaller diameters.

• true

• false

 The smaller the axon diameter, the greater the number of ions there will be to conduct current.

• true

• false

Tags

NGSS.HS-PS3-5

Impulse transmission involving the sensation of pain move faster than impulses involving thought or limb position.

• true

• false

When an action potential reaches the axon terminal, the terminal depolarizes, ______ gates open, and ______ions flow into the terminal.

• calcium, sodium

• sodium, calcium

• calcium, potassium

• calcium, calcium

The action potential is chemical & what occurs at the synapse is electrical. Thus, the transmission of impulses is an electrochemical event.

• true

• false