Synapses and Action Potentials

• Nucleus

• Cell Body

• Axon

• Node of Ranvier

Tags

NGSS.MS-LS1-3

This is the gap or space between two neurons

• Dendrites

• Cell Body

• Synapse

• Axon

What is the chemical used by a neuron to transmit an impulse across a synapse to another nerve cell?

• Neurotransmitters

• Synapse

• Threshold

• Impulse

When neural connections are repeatedly used, then it is likely that they will

• strengthen

• weaken

• be pruned

• become tired

Which is the correct order/sequence of the parts of a neuron in a neural impulse?

• axon, dendrite, cell body, synapse

• dendrite, axon, cell body, synapse

• synapse, axon, dendrite, cell body

• dendrite, cell body, axon, synapse

The gap between two neurons

• Nucleus

• Dendrite

• Soma

• Synapse

Synapses that are ____________ cause a neuron to fire whereas ____________ synapses reduce the likelihood that a neuron will fire.

• excitatory; inhibitory

• synaptic; terminal

• postsynaptic; presynaptic

• dendritic; axon

In an experiment on neural firing, a neuron is stimulated to the point of action potential. After the neuron fires, there is a brief period when it cannot fire again regardless of the strength of the stimulus. What is this period called?

• Threshold

• Refractory period

• Resting potential

• All-or-nothing basis

What is the primary function of synapses in the nervous system?

• Transmit electrical signals

• Store genetic information

• Facilitate communication between neurons

• Protect neurons from damage

Which ion is primarily responsible for the depolarization phase of an action potential?

• Calcium (Ca2+)

• Sodium (Na+)

• Potassium (K+)

• Chloride (Cl-)