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WorksheetsAction Potential, Synapse, & Neurotransmitters VERSION A
Total questions: 15
Worksheet time: 13mins
When a neuron is depolarized, what are the first channels to open?
Calcium
Potassium
Sodium
ACTH
When a neuron is not engaged in the transmission of an impulse.
Synaptic potential
Action potential
Neural potential
Resting potential
Why is -55 mV a significant number?
This is the largest charge achieved during an action potential
This is the charge when all the sodium is inside the cell
This is the resting charge of a neuron
This is the threshold required to complete an action potential
Why is the speed of an impulse increased if a neuron is wrapped in myelin?
potassium ions flow out of the neuron faster
myelin insulates the neuron so the temperature increases
the impulse can jump from node to node
it allows neurons to touch each other
In the figure above, what is occurring at step #4?
K+ channels open allowing K+ to diffuse out, repolarizing the membrane
Na+ channels open allowing Na+ to diffuse inward, depolarizing the membrane
K+ channels open and Na+ channels open, action potential begins
Neuron receives enough stimulation, threshold is reached
Na+ are being pumped out and K+ are being pumped into the cell
The space between a presynaptic and post synaptic neuron
Synaptic cleft
Dendrite gap
Nodes of Ranvier
Neuromuscular junction
When a membrane potential reaches +30mV, ________ channels open, ________ occurs, and ________ channels close.
Sodium, depolarization, potassium
Potassium, repolarization, sodium
Sodium, repolarization, potassium
Potassium, depolarization, sodium
Multiple sclerosis is an autoimmune disease in which the body's own immune system destroys the _____________ of the nerve axons.
Nodes of Ranvier
Dendrites
Axon Terminal
Myelin sheath
What chemical is activated by the action potential in the presynaptic neuron that causes the vesicles containing neurotranmitters to move toward the synaptic cleft?
Potassium
Sodium
Calcium
Phosphorus
What's in the picture?
Synaptic cleft
Neurotransmitters
Presynaptic neuron
Postsynaptic neuron
Synaptic vesicles
Three things that a neuron can form a synapse with are....
(Select THREE answer choices to get the grade)
Muscles
Surface of your skin
Other neurons
Glands
Drugs have their effects because they
(Select THREE answer choices to get the grade)
Mimic some neurotransmitters
Cause action potentials to move in reverse along the axon
Block the re-uptake of some neurotransmitters
Cause neurotransmitters to be released without a signaling action potential
Type of synapse which decreases the chance of the next neuron firing
Depressive
Excitatory
Saltatory
Inhibitory
Low levels of serotonin is linked to
Parkinson's
Alzheimer's
Depression
Schizophrenia
Prozac works to combat depression by keeping this neurotransmitter in the synapse longer:
Dopamine
Acetylcholine
Adrenaline
Serotonin
