Transcript What is the Structure of Neuron?

Do Now: Science Notebook Scavenger Hunt
Glue in your
notebook on
the next
blank page!
Texting and Driving
https://www.youtube.com/watch?v=mnw_7xI5klM
Texting and Driving
According to the CDC (Center for Disease Control)…
31% of U.S. drivers ages 18-64 reported that they had
read or sent text messages or email messages while
driving at least once within the 30 days before they were
surveyed.
Texting and Driving
Laws…
On September 30, 2009, President Obama issued
an executive order prohibiting federal employees
from texting while driving on government
business or with government equipment.6
On September 17, 2010, the Federal Railroad
Administration banned cell phone and electronic
device use of employees on the job.7
On October 27, 2010, the Federal Motor Carrier
Safety Administration enacted a ban that prohibits
commercial vehicle drivers from texting while
driving.
Source http://www.cdc.gov/motorvehiclesafety/distracted_driving/
Discussion Questions
Opinion Questions
Discuss with your lab group…
1.Why are there federal laws
prohibiting texting and driving?
2.Why do you THINK teens have the
highest reported cases of texting and
driving?
3.What do you THINK the nervous
system (brain, spinal cord, neurons)
have to do with texting and driving?
Notes: The Nervous System
• Turn to the next
blank page in your
notebook and glue in
these pictures!
FIRST, 1
THIRD, 3
SECOND, 2
What are the Functions of the
Nervous System?
1. Gather information – 5 senses
2. PROCESS information
–
brain and spinal cord
3. Send information or RESPOND
–
to muscles, glands and other organs
What are the 2 divisions of the
Nervous System?
• Central Nervous
System (CNS)
– Brain and spinal cord
(2 organs)
– Main control center
• Peripheral
Nervous System
(PNS)
– Nerves throughout
the body
– Gathers and
delivers information
What are Neurons?
• The basic functional unit of the
nervous system
• Neurons carry information in the
form of nerve impulses OR
action potentials
– Electrical & chemical signals
What is the Structure of Neuron?
AXON
What is the Structure of Neuron?
• Dendrites
– Receives chemical signals
– Carries information to cell body
– Many dendrites per neuron
• Cell Body
– Contain nucleus & organelles
– Coordinates impulse
What is an Axon?
– Carries information away from
cell body
– One axon per neuron
– Covered with myelin sheath
• Protective coating (Schwann cells)
• Nodes of Ranvier are gaps in sheath
• Impulses travel faster (jump from
gap to gap)
What is the Axon Terminal?
– Synaptic knob
release
neurotransmitter
• Chemical signal
• Neurotransmitter
Checking for Understanding
1. What are the functions of the
nervous system?
2. Describe 1 example of how the
CNS is different to the PNS.
(do not say their names!)
3. List 4 structures of a neuron.
Video: How Do Neurons Communicate?
What are the THREE Types of Neurons?
• Sensory neuron
– Conduct nerve impulses toward the CNS
– Reacts to stimuli
• Interneuron
– Connects sensory and motor neurons
– Located in brain and spinal cord
• Motor neuron
– Conduct nerve impulses away from the CNS
– Causes reaction in muscles, glands or organs
• https://www.youtube.com/watch?v=YRwPMICvbT4
Nervous System LAB
See example video click
https://www.youtube.com/watch?v=MRosXcIyNG4