nervous review Flashcards
a motor neuron conducts impulses
from the central nervous system to muscles
in relax arc the nerve impulses is started
in sensory receptors
the sympathetic system is responsible for
emergency situations
what is cerebrum function
thinking memory
what is cerebellum function?
Muscle coordination
what is the thalamus function?
Sensory input
What is the hypothalamus function?
Homeostasis
What is the mid brains function?
Vision
what is the corpus callosum function?
Connects left and right hemispheres
What is medulla oblongata is function
Controls heart blood pressure, breathing
The peripheral nervous system contains
Cranial nerves and spinal nerves
The PNS is subdivided it into
Somatic an automatic system
The somatic system serves
Muskoskeletal system an extra sense organs
the autoatic system serves
internal body organs 
What are the two divisions of auto somatic system?
parasympathetic and sympathetic
when schwann cells wrap around an axon this is called
myelin sheath
Gaps where myelin is not present on a neuron is
node of ranveir
an impulse, jumping from node to node is called
Saltatory conduction
when an axon is not conducting an impulse, the inside of the neuron is
Negative and at -65 mv
What does the sodium potassium pump do in resting potential?
maintain uneven distribution of Na and K ions am
In resting potential where are sodium ions are pumped
Outside and potassium in
what measures voltages during conductions of impulse
oscilloscope
Two main functions of spinal cord t
Receives info and send messages to brain
What is gray matter?
has unmyelinated cell bodies and contains interneuron
what is white matter
have myelinated interneuron a that run together in tracts
what does action’s potential mv change to
+40mv
What is the membrane of the first neuron in a synapse called
presynaptic membrane
What is the membrane of the next neuron in a synapse called
postsynaptic membrane
what is the gap between two membranes called
synaptic cleft
i when a nerve reaches a synaptic ending what happens
the membrane becomes permeable to calcium ions, causing milofilamenfs to pull vesicles
what enzyme breaks down acetylcholine
acetylcholinesterase
how are neurotransmitters removed
removed by enzymes or rapidly reabsorbed
how many cranial nerves are there
12 pairs
how many pairs of spinal nerves
31
what do receptors do
receives environment stimulus
what do effectors do
bring reaction to stimulus
he neurotransmitte used by the sympathetic nervous system is:
norepinephrine
outside of a neuron, the cytoplasm inside a resting neuron is :
negatively charged and the sodium ion concentration is lower inside than outside
increased sodium ions and a decreased potassium ions is observed during
action potential downswing
The distribution of sodium and potassium ions across the membrane of an axon is maintained by:
active transport
resting potential, which of the following conditions exist outside the neuron?
excess potassium
what event occurs during repolarization
potassium gates open
