PSYC 102 EXAM QUESTIONS AND ANSWERS WITH
COMPLETE SOLUTIONS GRADED A++
Neurons (nerve cells)
-only cell that communicates
-can't reproduce
-oddly shaped b/c of sending and receiving information
how many neurons are in central nervous system (CNS)?
1 trillion
3 types of neurons
-sensory neurons
-motor neurons
-interneurons
sensory neurons
-detect light, sound waves, taste & contact
-outside CNS
motor neurons
-movement that accomplishes goals
-inside CNS
interneurons
link motor && sensory neurons s
types of interneurons
,1. local interneurons
2. relay interneurons
local interneurons
form circuits w/ nearby neurons
-deal w/ reflexes
-does not go to the brain
relay interneurons
connect circuits from 1 region of brain to others
-deals w/ complex behaviors
Basic structures of neurons
1. cell body (soma)
2. dendrites
3. axon
4. terminal buttons
soma/cell body
-brain of neuron
-only structure that doesn't play role in communication
dendrites
-receives info from neurons
-right next to synapse
synapse/synaptic cleft
space between neurons
axon
, -carries info from soma to terminal buttons
-covered in myelin sheath
myelin sheath
-insulates axon & allows signal to travel faster
what happens if myelin sheath is destroyed ?
signals cannot be sent
terminal buttons
-release info into synapse that's picked up dendrites of other neurons
everything happening within the neuron is
electrical
everything that happens between neurotransmitters and synapse are
chemical processes
neurotransmitters (NTs)
-chemical messengers
-allow neuron to neuron communication
-either excite or inhibit receiving cell
-will always open ion channels
Nodes of Ranvier
-electrical signal travels thru
-helps w/ conduction
-sections allow neurons to receive additional signals
glia/glial cells
COMPLETE SOLUTIONS GRADED A++
Neurons (nerve cells)
-only cell that communicates
-can't reproduce
-oddly shaped b/c of sending and receiving information
how many neurons are in central nervous system (CNS)?
1 trillion
3 types of neurons
-sensory neurons
-motor neurons
-interneurons
sensory neurons
-detect light, sound waves, taste & contact
-outside CNS
motor neurons
-movement that accomplishes goals
-inside CNS
interneurons
link motor && sensory neurons s
types of interneurons
,1. local interneurons
2. relay interneurons
local interneurons
form circuits w/ nearby neurons
-deal w/ reflexes
-does not go to the brain
relay interneurons
connect circuits from 1 region of brain to others
-deals w/ complex behaviors
Basic structures of neurons
1. cell body (soma)
2. dendrites
3. axon
4. terminal buttons
soma/cell body
-brain of neuron
-only structure that doesn't play role in communication
dendrites
-receives info from neurons
-right next to synapse
synapse/synaptic cleft
space between neurons
axon
, -carries info from soma to terminal buttons
-covered in myelin sheath
myelin sheath
-insulates axon & allows signal to travel faster
what happens if myelin sheath is destroyed ?
signals cannot be sent
terminal buttons
-release info into synapse that's picked up dendrites of other neurons
everything happening within the neuron is
electrical
everything that happens between neurotransmitters and synapse are
chemical processes
neurotransmitters (NTs)
-chemical messengers
-allow neuron to neuron communication
-either excite or inhibit receiving cell
-will always open ion channels
Nodes of Ranvier
-electrical signal travels thru
-helps w/ conduction
-sections allow neurons to receive additional signals
glia/glial cells
