Chapter 3 questions Flashcards
Postsynaptic potentials are a type of
graded potential
The resting membrane potential is ….
Partially established by the uneven distribution of ions across the membrane.
In the extracellulra or intracellular fluid what is the anion
chloride
The size of the gap between the presynaptic membrane and the postsynaptic membrane in a chemical synapse is….
20 to 40 nm
Norepinephrine and dopamine are examples of transmitters whose synaptic activity is terminated by…
Reuptake
Action potentials are not propagated along dendrites because dendrites lack …
Voltage-gated ion channels
The term “hyperpolarization” refers to…
movement of the resting membrane potential away from 0 mV.
Presynaptic events are presented in order…
Action potential reaches axon terminal, calcium ion channels open, exocytosis, diffusion of neurotransmitter
The giant axons of some invertebrates conduct action potentials at speeds up to _____ m/s
20
The simplest neural circuit is the…
neural chain.
An after potential is ….
A brief hyperpolarization that follows an action potential (undershoot)
_____ seizures do not involve the entire brain.
Complex Partial
At the peak of the action potential, the axonal membrane approaches the equilibrium potential for…
Na+
The absolutel refractory period refers to the brief period of time…
After a neuron has fired an action potential during which the same neuron cannot fire agian.
The phenomenon in which one neuron sends signals to may other neurons is called…
Divergence
