Mystery
True or False. Two neurons form a junction called
synapse
True
This region of the neuron contains the nucleus and most protein-synthesizing organelles.
Soma
The typical resting potential of a neuron is about this many millivolts
-70mV
The threshold for firing an action potential is around this voltage.
What is –50 to –55 mV?
Gaps in the myelin sheath are called ___.
What are nodes of Ranvier?
What is Tetrodotoxin (TTX)?
Neurotoxin found in pufferfish that can cause neuron communication failure
These short extensions receive incoming electrical signals
Dendrites
Depolarization occurs when the membrane potential becomes more of this compared to resting.
Positive
The rapid depolarization phase is due to the opening of these channels.
What are voltage-gated sodium channels?
Myelin speeds conduction because action potentials jump in this manner.
Saltatory Conduction
What would novocaine do to voltage gated sodium ion channels?
Blocks the voltage gated channels
The axon hillock is the site where this critical event begins
Action Potential
The two driving forces on ion movement are these.
What are chemical (concentration gradient) and electrical forces?
These are the three functional states of the voltage-gated sodium channel.
What are closed, open, and inactivated?
The release of neurotransmitters by vesicles is called ___
Exocytosis
Draw a neuron and label
This part of the neuron releases neurotransmitters into the synaptic cleft
Axon Terminals
At rest, sodium’s chemical and electrical gradients both push it in this direction
Inward
After repolarization, the neuron briefly hyperpolarizes due to this.
What is delayed opening (and slow closing) of voltage-gated potassium channels?
Neurotransmitters are released into this space between neurons.
Synaptic Cleft
Haha sucks for you, draw and label the action potential graph with everything labeled
+30, -55, -70, Threshold, Peak Potential, Resting Potential
These cells form myelin in the CNS, while these cells form myelin in the PNS.
What are oligodendrocytes (CNS) and Schwann cells (PNS)?
This is actually the easy one, Draw a Synapse
Good job
The refractory period ensures this about action potential conduction.
What is that action potentials only travel in one direction
True or False, The Na⁺/K⁺ pump moves 2 sodiums into the cell and 3 potassiums out.