Pause to take a quiz on the
structure / function of neuron
Accepts impulses?
Provides insulation?
Relays away?
Impulses generated (begin)?
Two processes?
Unit 6 Day 5 Anatomy
Great minds have
purposes, others have
wishes.
Washington Irving
Today’s Agenda
• Review the parts of the brain (using
transparency)
• Review the parts of the neuron (using
drawing on board)
• Daily Quiz
• Finish viewing Osmosis Jones
Unit 6 Day 6 Anatomy
The art of being wise is the
art of knowing what to
overlook.
William James
Today’s Agenda
• Revisit nerves (diagram/ws)
• Notes on objectives 4-9
• Video clip on nerves/reflexes
• Practice reflex arc labeling
Structure of a Nerve
(Objective 3)
Objective 2: Neuron Structure
Objective 2 cont.
Objective 4 introduction
Objective 4: Membrane Potential
Objective 4
• Resting Potential is the
electrochemical condition
of the neuron that is not
firing.
Objective 4
• ACTION Potential is the
electrochemical condition
of the neuron that is
firing.
Neural Conduction is based on
movement of Na and K.
Obj. 5: Saltatory Conduction
• Movement of neuron impulse
that is sped up by the
presence of the myelin
sheaths. Much faster that
unmyelinated conduction.
Myelin sheaths allow faster
conduction.
Obj.6: Synapse-gap
between two neurons.
Obj. 6 Continued
• Electrical Synapse relay
electrical charges across
synapse.
• Chemical Synapses release
neurotransmitters
(chemicals)
Obj.6: Synapse-gap
between two neurons.
Objective 7:
• Excitatory Postsynaptic
potentials make the neuron
MORE likely to fire. (raise)
• Inhibitory Postsynaptic
potentials make the neuron
LESS likey to fire.(more -)
Objective 8: Neurotransmitters
• Function: Transfer the
impulse to the next
neuron.
Objective 8: Neurotransmitters
• Acetylcholine
• Biogenic Amines
• Amino Acids
• Peptides
–(SEE SEPARATE LISTING)
Reflexes:
• Purpose: Shorten the body’s
response time to specific
stimuli.
Reflexes:
• Reflex Arc:
The pathway of a reflex—
receptor-sensory neuroninterneuron-motor neuroneffector
See transparency