QUIZ: Neuron Structure, Division of NS, Action Potential

First Name

Last Name

Period

• 2
• 4
• 6

The functional connection between two neurons is a ______________________.

• Action Potential
• Gap Junction
• Dendrite
• Synapse

Information is transmitted through the nervous system when one neuron signals another neuron. The structure of neurons enables transmission to proceed quickly and efficiently. Which of the following diagrams correctly identifies both the structure of neurons and the direction of information flow between neurons?

• A
• B
• C
• D

According to letter A which of the following explains what is happening within the cell membrane?

• only the sodium channels are open allowing Na+ ions to move inside the cell
• only the sodium channels are open allowing Na+ ions to move outside the cell
• only the potassium channels are opened allowing K+ ions to move inside the cell
• both sodium and potassium channels are closedleading to no movement of ions

According to letter D which of the following explains what is happening within the cell membrane?

• the sodium-potassium pump is actively restoring the concentration gradient in and out of the membrane
• the membrane is negatively charged
• the neuron will not be responsive to any new stimuli for a brief period of time
• ALL answer choices are correct

The diagram above depicts the response to a pinprick (stimulus) on the tip of a human finger. The arrows show the direction of impulse transmission along the labeled axons. If axon II was damaged before the pinprick, which of the following is most likely?

• The person will not feel the pinprick.
• The person can no longer feel pain.
• The person’s finger will not withdraw reflexively.
• The person cannot transmit nerve impulses to the brain

Identify structure B of the diagram

• Schwann Cell
• Cell Body
• Dendrite
• Node of Ranvier

Cytoplasmic extensions that receives and conducts messages towards the cell body, providing the main receptive surfaces for neurons are

• Oligodendrocytes
• Axon
• Nodes of Ranvier
• Dendrite