1. 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 , Work on How the Nervous System Works Booklet HW: Complete How the Nervous System Works Booklet; INERH EXAM, March 23

2. 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

3. 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

4. Nervous System Notes

8. NERVE CELL FIRING

9. 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.

10. Reflex Arc
SPINAL CORD
SENSORY NEURON
INTERNEURON
MOTOR NEURON

11. Nerve Synapse

13. Site of Memories

14. NERVE CELL FIRING