1. HW: “How the Nervous System Works” reading and questions
HW: “How the Nervous System Works” reading and questions. Sherlock #25-end due Friday.
Do Now: 1/17/17 Listen carefully to the part of the story that is about to be read to you. How does this relate to the body system we will be learning next?

2. Scientific Sherlock Observations # 21-24

3. The Nervous System
I. Function of the Nervous System:
A. Receives and sends information throughout the body
B. Also, it interprets and responds to changes in the environment
Brrrrr
I’m feeling cold

4. The Nervous System Stimulus: a signal to which an organism reacts
Ex. Scary movie scene
Response: action or
movement of
an organism brought
on by a stimulus
Ex. Screaming

5. A. Specialized cell that carries messages (impulse)
II. The Neuron:
A. Specialized cell that carries messages (impulse)
/tip
B. Messages are carried from dendrites to axon terminal in ONE DIRECTION ONLY!

6. Yes, she said in “One Direction!”

7. Neuron Model
The simplest “model” of a neuron is your hand.

8. Dendrites Cell Body Nucleus Axon Tips/Terminals Axon USE THE WORD BOX
TO LABEL
THIS DIAGRAM
Dendrites
Cell Body
Nucleus
Axon Tips/Terminals
Axon

9. Transmitting molecule Axon Tips/Terminals
USE THE
WORD BOX
TO LABEL
THIS DIAGRAM
Transmitting molecule
Axon Tips/Terminals
Synaptic Cleft
Dendrite

10. Pictures of Actual Neurons

11. III. Three Types of Neurons (SIM)
A. Sensory: Detects the stimulus and sends a message
Found in sensory organs (ex: eye, skin, nose)
B. Interneuron: Interprets message from sensory neurons
Found in the Spinal cord and Brain
C. Motor: Carries the message to respond to the stimulus
Found in muscles or glands

12. Pathway of a Message Stimulus Sensory Neuron Interneuron Motor Neuron
Muscle or gland
Response

13. Tim and Moby Explain the Nervous System