Admit Slip

Complete the Ch.8 Pre-Test

1/26/15

Date: 1/26/15 Topic: Biochemistry Page # ___

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 # ___

Left-Brained

Right-Brained

Admit Slip: Which one are

you? Why?

Right Brain vs Left Brain Video: https://www.youtube.com/watch?v=

gdpkxjEyuJ4

Yesterday Review:

Cerebrum

Cerebellum

Brain Stem

Hypothalamus

Responsible for…

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

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*

Example: Water shortage in the

body

Hypothalamus

Sensoryneurons

Increased sodium

Pituitary gland

Vasopressin

Carried throughout body

kidneysMore water

reabsorbed by body

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

Feedback Loop Examples

Come up with one for each!

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

Signaling*Two types of cells

Neurons = produce, send, and receive signals

Glial cells = protect, support, and insulate neurons

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

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

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

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

Neurons connect to each other

k Action potential = peak of electrical impulse(must be reached to transmit signal)

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

Draw & Label

in Journal*

What is this called??

Make a Neuron!Using all the types of candy provided, make a neuron! Use your journal picture (and this one) to help you!

MCAS Questions

See attached document

The Nervous System:

The Nervous System:

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.