Question

ORDERING:

1. Number these in the proper sequence as they occur through a full action potential cycle beginning with the cell at -70mV.

___ action potential

___ depolarization

___ hyperpolarization

___ threshold

___ resting potential

___ polarization

2.

Number these in the proper sequence as they occur through a full long-term potentiation cycle beginning with the next thing that would occur after the neurotransmitter has been released into the synapse. (6 points)

___ calcium activates second messenger pathways

___ cell becomes more sensitive to glutamate

___ net sodium entry through AMPA channels depolarizes the post-synaptic cell

___ glutamate binds to NMDA and AMPA channels

___ calcium enters cytoplasm through NMDA channel

___ depolarization ejects magnesium from NMDA receptor-channel and opens the channel

Answer 1

1. Polarization ----> Resting potential --------> Threshold ---------. Depolarization --------. hyperpolarization ----------> Action potential.

2. Glutamate binds to NMDA and AMPA channels.-------> Net sodium entry through AMPA channels depolarizes post synaptic cell. ---------> Depolarization ejects magnessium from NMDA receptors channel and opens the channel. ------> Calcium enters cytoplasm through NMDA channel ------> Calcium activates second messanger pathway. ------> Cells become more sensitive glutamate.