anatomy intro to nervous system quiz Flashcards
functions of the nervous system
monitors internal + external environments
integrates sensory information
coordinates voluntary and involuntary responses in other organ systems (along with endocrine system)
neurons purpose is to:
transfer, process, and store information
neuroglial cells function is to:
support framework for neurons
sensory neurons:
monitor internal+external environments
deliver information to the central nervous system
afferent division
motor neurons:
delivers signals to muscles/organs
stimulate or inhibit peripheral tissues
efferent division
interneurons:
located between sensory and motor neurons (in brain and spinal cord)
analyze inputs, coordinates outputs
roles in memory, learning and planning
create myelin sheath around neurons
oligodendrocytes
defense and disposal of debris
mircoglia
maintain the blood-brain barrier
astrocytes
circulate cerebrospinal fluid
ependymal cells
many dendrites, one axon
multipolar
continuious dendrite and axon
unipolar
one dendrite, one axon
bipolar
what structure determines if a neuron willl use continuous or saltatory propagation?
Myelin sheath,
myelinated axons allow for faster saltatory conduction while unmyelinated axons use continuous conduction
do nerve cells directly touch eachother
no
at rest, a normal nerve cell has more sodium or potassium ions inside
potassium (SALTY BANANA)
At rest, what is the membrane potential
-70mV
what is happening during depolarization
membrane potential becomes positive
sodium is rushing into the neuron
what is the refractory period
a brief time after an action potential when the neuron is unresponsive to stimulation
starts @ stimulus ends when back @ resting and back to SALTY BANANA
true or false: convergent neuronal pools spread information from one neuron to several others
False, convergent means a bunch of neurons spread to ONE spot
