IB Topic 6.5

The long, fiber like part of a neuron which the cell sends information to receiving neurons

• axon

• dendrite

• axon terminal

• myelin sheath

Tags

NGSS.MS-LS1-2

The part of the neuron that picks up stimuli from surrounding cells.

• axon

• axon terminal

• dendrite

• neuron

This insulating material forms a layer, around the axon of a neuron. It enables electrical signals to travel down the axon at higher speeds.

• neuron

• myelin sheath

• dendrite

• neurotransmitter

At resting potential, the ion distribution inside and outside of a neuron is such that _______ ions are most abundant outside of the cell, while _______ ions are most abundant on the inside of the cell.

• potassium, sodium

• sodium, potassium

• calcium, potassium

• calcium, sodium

In the figure above, what is occurring at step #4?

• Neuron receives enough stimulation, threshold is reached

• K+ (potassium) open and NA+ channels open, action potential begins

• K+ (potassium) channels open allowing K+ to diffuse out, repolarizing the membrane

• Na+ are being pumped out and the K+ are being pumped into the cell

What is the structure labeled D in the picture?

• dendrite

• axon

• cell body

• axon terminal

Which number on the graph represents the resting state?

• 1

• 2

• 3

• 4

When a neuron is depolarized, what are the first channels to open?

• sodium gated channels

• potassium gated channels

• sodium and potassium gated channels open at the same time

• both sodium and potassium gated channels are already open, as it is passive transport

-70 mV is the measure of the ______.

• threshold potential

• action potential

• resting state/potential

• end point potential

Tags

NGSS.HS-PS3-5

An action potential going from positive to negative is called______.

• hyperpolarization

• depolarization

• repolarization

• polarization