Neuron Formative Quiz

Imagine Elijah is flipping a light switch. The light either turns on completely or stays off—there is no in-between. What principle does this scenario best illustrate in the context of neuron firing?

• The light turns on partially depending on how hard Elijah flips the switch.

• The light either turns on completely or does not turn on at all.

• The light can turn on at varying intensities.

• The light turns on only when Elijah flips multiple switches at once.

What happens to a neuron after it fires according to the electrochemical message?

• It remains in an active state.

• It returns to resting potential.

• It becomes permanently inactive.

• It increases its firing rate.

Emma is learning about how messages travel in the nervous system. She reads that when a neuron's electrical impulse reaches the synaptic knobs, something is released from the synaptic vesicles into the cleft. What is released?

• Neurotransmitters

• Hormones

• Enzymes

• Proteins

Imagine Emma is learning about how her brain works. When an excitatory neurotransmitter is released in her brain, what does it do to the receiving cell?

• It causes the receiving cell to stop firing.

• It causes the receiving cell to fire.

• It has no effect on the receiving cell.

• It decreases the activity of the receiving cell.

Jackson is learning about how messages travel quickly in the nervous system. What is the function of the myelin sheath in neurons that helps with this process?

• To allow ions to diffuse in and out of the neuron

• To change electrical impulses into chemical messages

• To insulate, protect, and speed up the neural impulse

• To contain chemicals or neurotransmitters

During a neuroscience experiment, Olivia is observing how electrical signals travel along a neuron. She notices that there are specific parts of the neuron where ions can diffuse in and out, helping the electrical signal move down the axon. Which part of the neuron is Olivia observing?

• Myelin Sheath

• Node of Ranvier

• Axon Terminal

• Synapse

During a science experiment, Grace is studying how neurons communicate. She observes that when an electrical impulse reaches the end of a neuron, something happens that allows the message to be passed to the next cell. What is the role of the axon terminal in this process?

• To insulate and protect the axon

• To allow ions to diffuse in and out

• To change electrical impulses into chemical messages

• To contain neurotransmitters

Identify the parts of the neuron.

a

b

c

d

e

f

Cell Body

Myelin Sheath

Dendrites

Nucleus

Axon

Axon Terminal