Chapter 37 Vocab/Comprehension Flashcards

nerve cells that transfer information within the body


gives the neurons nourishment


allows for the sensory input/motor output

Peripheral nervous system (PNS)

allows for integration/information comes in and is interpreted

Central nervous system (CNS)

Neurons maintain a _______ ______.

membrane potential

________ ______ can be measured by inserting electrodes into cells.

action potentials

There is a ______ _____ after the depolarization during which time
the sodium channels remain inactivated.

refractory period

The axons of motor and sensory neurons are bundled together to form _____.


At some synapses, there is a direct electrical connection between the
neurons, but most are ______ synapses.


The cone snail kills prey with venom that ______ neurons.


_______ are the structural and functional units of the nervous system.


What are the two types of signals neurons use to communicate?

electrical and chemical

Neurons are supported by ____.


_______ collect chemical information.


The information is transferred down the _____ _____ then down to the axon.

axon hillock

Then, it goes down the ______ ______ and there is a release of more
chemical messengers.

synaptic terminals

Higher concentration of ____ on the outside.


Higher concentration of ____ on the inside.


The sodium potassium pump spends ____ energy.


______ signals are transmitted down the neuron as voltage changes
open and close gated channels in the membrane.


Why are impulses only propagated in one direction?

the refractory period

In the PNS, ______ cells wrap around the axons creating layers of
membrane lipids that are poor conductors of electricity.


In the CNS ______ cells wrap around the axons creating layers of
membrane lipids that are poor conductors of electricity.


The _____ _____ results in faster transmission of the electrical signal.

myelin sheath

Signals are passed between neurons at junctions called _____.


What holds neurons together at a synapse?

membrane proteins

if multiple excitatory signals come down a single axon close enough
together in time, threshold depolarization may be reached

temporal summation

if multiple excitatory signals are transmitted from several neurons
at the same time, threshold may be reached

spatial summation

if the summation of signals does not depolarize to threshold, no
______ ______ is generated.

action potential