Module 2 HW Questions Flashcards
What type of membrane channel will an excitatory neurotransmitter open to initiate depolarization in a resting neuron?
ligand gated
What type of channels open once a neuron reaches threshold?
voltage gated
Which phase of an action potential reaches +30mV?
peak
Which phase of an action potential are voltage gated sodium channels closed and voltage gated potassium channels open?
repolarization
Which phase of an action potential are voltage gated potassium channels closed and voltage gated sodium channels open?
depolarization
Which phase of neuron action potential does the membrane become more negative than resting membrane potential?
hyperpolarization
What process depolarizes and then repolarizes each section of an axon as it travels down the axon?
propagation of an action potential
What type of conduction of an action potential only depolarizes the nodes of ranvier?
saltatory conduction
Which refractory phase can a neuron respond to additional signals if the signals are stronger than normal?
relative refractory
What type of membrane potential makes the membranes less negative inside, but it does not reach threshold?
subthreshold potentials (EPSP)
Which type of potential moves the neurons membrane away from zero?
local hyperpolarization (IPSP)
What is a decrease in membrane potential as it moves from the postsynaptic synapse toward the soma?
decremental conduction
The cytoplasm of a neuron at rest is _______ in potassium and _________ in sodium ions?
high, low
A neuron’s cell membrane has more _____ leaky channels than _______ leaky cells
K+, Na+
The charges across a neuron’s cell membrane at rest are ____________ on the outside and ____________ on the inside
positive, negative
What is the resting membrane potential of a neuron?
-70mV
When is neuron’s cell membrane considered polarized?
at rest
How do intracellular AAs affect resting membrane potential of a cell membrane?
bind with K+
What extracellular condition reduces potassium efflux making the inside of a neuron more positive?
hyperkalemia