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OBJ: Given notes, video, activity sheet SWBAT explain the
function of the nervous system and the structure and
kinds of neurons found in the body with 70% accuracy.
BRING IN TEXT BOOK
DN: HW check- Infectious Disease and Body’s Defenses
Activity Sheets (p. 300, 308); Video: Human Nervous
System (Part 1)
ACT: Introduction to the Nervous System (Notes)
Text, read p. 176-180, Work on How the
Nervous System Works Booklet
HW: Complete How the Nervous System Works Booklet;
INERH EXAM, March 23
Nervous System Notes
Nervous System: receives and responds to
information gotten both inside and outside of the
body; also helps to maintain homeostasis.
Stimulus: an environmental signal that an
organism reacts to.
Response: what the body does in reaction to a
stimulus.
Neuron (nerve cell): specialized cell that carries
information; building block of Nervous System.
Nerve Impulse:message/information being carried
Nervous System Notes
Neuron: consists of nucleus, axon and
dendrites.
Dendrites: carries impulses toward the cell
body.
Axon: carries impulses away from the cell
body.
Nerve fibers: axons & dendrites
Nerve: bundle of nerve fibers
Nervous System Notes
NERVE CELL FIRING
Nervous System Notes
Three kinds of neurons:
Sensory Neuron: picks up stimuli and converts
it into an impulse.
Interneuron: carries impulse from one neuron to
another neuron (within brain or spinal cord).
Motor Neuron: brings impulse to muscle or
gland which then reacts in response.
Nerve impulse: begins in a nerve cell’s dendrite,
travels down axon to axon tip where it crosses
over to the next nerve cell at the synapse.
Synapse: is the gap between the axon tip and the
neighboring dendrite. Chemicals (dopamine,
seritonine) carry the impulse across the synaptic
gap.
Reflex Arc
SPINAL CORD
SENSORY NEURON
INTERNEURON
MOTOR NEURON
Nerve Synapse
Site of Memories
NERVE CELL FIRING