complete the ch.8 pre-test 1/26/15 date:1/26/15topic:biochemistrypage # ___
TRANSCRIPT
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Admit Slip
Complete the Ch.8 Pre-Test
1/26/15
Date: 1/26/15 Topic: Biochemistry Page # ___
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Today in Room 311…
ADMIT SLIP: Are you left or right brained?HW: Paragraph using vocab on how a signal is passed through the bodyCONTENT OBJ: SW describe the structure and function of a neuronLANG. OBJ: SW verbally identify the parts of their candy neuronAGENDA:Left/right brainFeedback LoopsSignalingNeuron StructureMCAS questions
Date: 10/20/15 Topic: Nervous System Page # ___
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Left-Brained
Right-Brained
Admit Slip: Which one are
you? Why?
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Right Brain vs Left Brain Video: https://www.youtube.com/watch?v=
gdpkxjEyuJ4
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Yesterday Review:
Cerebrum
Cerebellum
Brain Stem
Hypothalamus
Responsible for…
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Signaling*
*Endocrine system: Made up of many glands and cells that produce and release chemical messengers into the blood
*Chemical messengers = hormones
“Raging hormones” ?
Levels change as you sexually mature, but hormones help maintain homeostasis for people of all ages
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Hormones*
Chemical substance produced by the body that controls the activity of cells or organs*
Blood transports hormones past every cell of the body, but only certain “target” cells/organs can respond
Cells must have the right receptor for that hormone*
*Receptors are proteins that fit the shape of a specific hormone molecule
Lock & key interaction*
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Example: Water shortage in the
body
Hypothalamus
Sensoryneurons
Increased sodium
Pituitary gland
Vasopressin
Carried throughout body
kidneysMore water
reabsorbed by body
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Feedback Loops*Negative feedback: systems work to shut off the response that the body had to being out of balance
Ex. Vasopressin (once body is back to normal sodium levels, the hypothalamus stops releasing vasopressin)
Positive feedback: adjusts internal conditions towards the initial condition
Ex. blood clotting
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Feedback Loop Examples
Come up with one for each!
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Neurons*
What’s a neuron?
Nerve cell: A specialized cell that transmits nerve impulses
Example?
Run throughout our body
Send signals to each other
Relay messages to thebrain
JOURNALS OUT!!Video: https://www.youtube.com/watch?v=kr7dGPOwzsA
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Signaling*Two types of cells
Neurons = produce, send, and receive signals
Glial cells = protect, support, and insulate neurons
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Neuron Fun FactsAverage # of neurons in the brain= 100 billion
Rate of neuron growth duringfetal development = 250,000 neurons/minute
Neuron width is thinner than a human hair
Speed of signal transmitted througha neuron = 250 miles/hour
All your neurons lined end to endwould span about 600 miles
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Neuron StructureWhy are telephone wires coated in plastic or rubber? Same with TV cords, cell phone chargers, etc.?
The rubber insulates the electric signal!
Allowsmessageto becarried
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Neuron StructureNeurons in the brain work the same way!
The carry electric signals to and from the brain,so they need insulation to successfully carry thesignal wherever it needs to go
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Neuron Structure*Today we will use candy to createa neuron that has all necessary components!
All candies shouldbe used. But it’s up to you how to do it!
Hint: The red vinesare hollow!
Then, label your neuron, check w/ Ms. Gately, & take a picture!ALSO, you MUST draw an image of a label neuron in your
journal
Draw
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Neurons connect to each other
k Action potential = peak of electrical impulse(must be reached to transmit signal)
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Signal Transmission*• Neurotransmitter
= a chemical substance that is released at the end of a nerve fiber by the arrival of a nerve impulse (signal)
• By diffusing across the synapse, causes the transfer of the impulse to another nerve fiber
I will come give you a swedish fish. Please break this into little “neurotransmitters” to place between your neurons to represent signal
transmission
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Draw & Label
in Journal*
What is this called??
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Make a Neuron!Using all the types of candy provided, make a neuron! Use your journal picture (and this one) to help you!
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MCAS Questions
See attached document
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The Nervous System:
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The Nervous System:
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Homework
Write a paragraph, using ALL the vocabulary learned today, that describes the transmission of a nerve impulse (signal) throughout the body.
Start with when a signal first hits the dendrites of a neuron.