neurons & resting membrane potential Flashcards
type of neuron that conducts signal away from CNS
efferent neurons
type of neuron that conducts signal towards CNS
afferent neurons
neurons entirely within CNS
interneurons
a cell that is able to generate and propagate an electrical signal
neuron
4 parts of a neuron
- dendrite
- soma (cell body)
- axon
- axon terminal (pre-synaptic terminals)
part of neuron that receives info
dendrites
starts to send electrical signal to cell
part of neuron that has all organelles and deals with protein synthesis
cell body (soma)
part of neuron that propagates action potential
axon
part of neuron that releases the neurotransmitter (NT)
axon terminal (pre-synaptic terminal)
neurons generate signals that are ____ and _____.
fast, addressed (specific)
cells in the nervous system that support neural function
glial cells
3 types of glial cells
- Schwann cells
- astrocytes
- microglial cells
type of glial cell that wraps around axons and forms myelin sheath
Schwann cells (PNS)
type of glial cell that regulates neuron and helps get & use nutrients
astrocytes (CNS)
type of glial cell that deals with immune function & protects neuron from damage
microglial cell (CNS)
difference in charge across the neuron (axon) membrane
resting membrane potential
Membrane potential (MP):
inside cell–
higher ____ concentration
lower _____ concentration
higher K+
lower Na+ and Cl-
what is the resting membrane potential
-65 mV
Na+ MP
+58 mV
Na+ flows into cell
K+ MP
-80 mV
K+ flows out of the cell
when the MP is more positive than the RMP
depolarized
when the MP is more negative than the RMP
hyperpolarized
Na+ and K+ can leak through the membranes.
Na+ leaks ____
K+ leaks ____
Na+ leaks in slowly
K+ leaks out slowly
is the membrane more permeable to Na+ or K+?
K+