6.5 IB Neurons & Action Potentials

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

• axon

• dendrite

• axon terminal

• gene

Answer explanation

You need to be able to recognize the different parts of a neuron, so make sure you study it!

Tags

NGSS.MS-LS1-2

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

• axon

• axon terminal

• dendrite

• neuron

Answer explanation

Although the dendrite and axon terminal look similar, the dendrite is larger and contains the cell's nucleus.

Tags

NGSS.MS-LS1-2

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

Answer explanation

You need to be able to recognize the different parts of a neuron, so make sure you study it!

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

• Potassium; sodium

• Sodium; potassium

• Calcium; potassium

• Calcium; sodium

Answer explanation

You need to make sure you know which ions are where during each stage of an action potential.

Tags

NGSS.HS-LS1-3

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

• Neuron receives enough stimulation, threshold is reached

• Na⁺ channels open allowing Na⁺ to diffuse inward, depolarizing the membrane

• K⁺ channels open and Na⁺ channels open, action potential begins

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

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

Answer explanation

Learn the action potential graph and know what ions are where.

What is structure labeled C in the picture?

• Dendrite

• Axon

• Cell Body

• Axon Terminal

Answer explanation

You need to be able to recognize the different parts of a neuron, so make sure you study it!

Tags

NGSS.MS-LS1-2

What is structure labeled B in the picture?

• Dendrite

• Axon

• Cell Body

• Axon Terminal

Answer explanation

You need to be able to recognize the different parts of a neuron, so make sure you study it! The axon is the part of the neuron where the majority of the action potential is propagated and it is extremely long.

Tags

NGSS.MS-LS1-2

What is structure labeled D in the picture?

• Dendrite

• Axon

• Cell Body

• Axon Terminal

Answer explanation

You need to be able to recognize the different parts of a neuron, so make sure you study it!

What is structure labeled H in the picture?

• Nucleus

• Schwann Cell

• Node of Ranvier

• Myelin Sheath

Answer explanation

You need to be able to recognize the different parts of a neuron, so make sure you study it! The Nodes of Ranvier are the only places where the gated channels are located.

Which number on the graph represents the Resting Potential?

• 1

• 2

• 3

• 4

• 5

Answer explanation

The resting potential is the always around -70mV and is where the neuron is not being stimulated.