1. How does the nervous system coordinate movement?
What is a Neuron? Sheet
Suggested: Chapter 17.1/17.2 & 17.3/17.4 Sheet
1. No after school help on Thursday- I won’t be here!
2. Work on your homework packet- don’t save it all for the last minute!
Why are there many branched endings at each end of the neuron?
Starred thought of the Day
*If you want credit for your successes, you have to take responsibility for your failures.*
We worked on questions about the nervous system- some are posted below to help you review.
1. What is a neuron’s job?
A neuron’s job is to pass messages around the body to respond to stimuli in the world.
2. Neurons plug into each other, like electrical cords into the wall
b) False- Neurons never touch, there is a space between them called the synapse.
3. When a neuron fires, describe what happens to the charge of the cell.
When resting, a neuron is more negative inside when compared with the outside of the cell. When a neuron fires, the opposite happens, and the charge becomes more positive inside the cell when compared with the outside of the cell (Note- my notes had the wrong info: we changed this in class)
4. The job of sensory neurons is to directly move muscles
b) False- sensory neurons take information and send in to be interpreted- they don’t move muscles directly, but may indirectly.
5. Describe how neurons send signals to other neurons
Neurons don’t touch, so they send neurotransmitters from the tip of the axon to the next neuron to pass the message on.
6. Multiple Sclerosis is a disease in which the myelin sheath is seen as an invader by the immune system. Describe the effects.
The myelin sheath helps speed up nerve impulses. If immune system destroys the myelin sheath of different neurons, the messages would be slow or undelivered, and you wouldn’t be able to respond quickly.
7) Put these in order:
Sensory Neuron—> Interneuron—> Motor Neuron
Work on HW packet