1. Take out WS#1 Starter #4 Identify the following layers.
10.____________
9. _____________
8. _____________
Describe two functions of skin.

2. announcements Collecting WS#1
Page 1 (integumentary) of coloring packet DUE TOMORROW
Biome research packet DUE TOMORROW
Please bring in wire hangers

3. NERVOUS SYSTEM I PP

4. FUNCTION
Network of neurons that communicate and control the body through electrical impulses
Includes neurons, brain and spinal cord

5. NEURON
An electrically excitable cell that transmits and processes messages through electrical signals.

6. NEURONS Cell Body: houses most organelles
Axons: extension of cell body
Axon terminal: end of the axon
Dendrites: receive messages from other neurons
Direction of impulse

7. NEURONS
Myelin sheath: lipid layer around axon (insulator= increased rate)

8. NEURONS Dendrites: receive messages from other neurons
Synapse: gap between neurons

10. What do you see?

11. TYPES OF NEURONS
Sensory (5 types) – carry information from the senses back to the brain
Motor – brings message from CNS to muscles/glands.
Interneurons – connect sensory and motor and carry impulses between them.

12. Sensory Receptors ( 5 types)
Neuron that detects stimuli.

13. Mechanoreceptors
Detect pressure and movement
Sense: Hearing and touch

14. Thermoreceptor
Detect temperature

15. Pain receptor
Detect tissue damage

16. Chemoreceptors
Detects chemicals
Sense: Smell and taste

17. Are the lines straight or crooked?

18. Photoreceptor
Respond to variation in light
Sense: sight

19. Assignment
Nervous System Microslides