Ch.8 and 9
central nervous system (CNS)
-One half of nervous system.
- Consist of Brain and Spinal cord.
-Acts as integrating center
... [Show More] peripheral nervous system (PNS)
-One half of nervous system.
-Everything that is not brain or spinal cord.
-It consists of two subdivision afferent
neurons or efferent neurons.
Afferent neurons.
-Part of the PNS. Brings info back to the
CNS.
-Afferent->approaching to the main
CNS(input/sensory).
Afferent=approach
-Afferent neurons bring sensory information
->CNS (from PNS->CNS)
Efferent neurons
-Efferent=exit
-Efferent neurons carries motor commands
away -> PNS (from CNS->PNS) to target
cells
-Efferent divides into 2 division: Autonomic
neurons and Somatic motor neurons
Somatic Motor neurons
-controls skeletal muscles
Autonomic motor neurons (sympathetic and
parasympathetic divisions).
-One part of efferent neurons controls
smooth and cardiac muscles, glands, adipose
tissue.
-Has 2 division: Parasympathetic and
sympathetic
-Autonomic = automatic ex. Heart, stomach.
-sympathetic= fight or flight
-parasympathetic=rest and digest
synapse.
-Region where an axon terminal meets its
target cell.
-Junction connection where communication
is made.
-Monosynaptic-1 joint and 2 neurons
ganglia
-is a cluster of nerve cell bodies inside the
CNS.
-ganglia appear as knots or swelling along a
nerve.
The rising phase of the action potential.
-is due to increased Na+ flow into the cell
The falling phase of the action potential.
Is due to K+ flow out of the cell
Overshoot point.
-is the point during an action potential when
the inside of the cell has become more
positive than the outside.
The absolute refractory period of an action
potential.
-Once an action potential has begun, there is
a brief period known as the absolute
refractory period during which a second
action potential cannot be triggered, no
matter how large the stimulus is because of
this, action potentials [Show Less]