Catalyst #14 Pg. 71-

Take out Flashcards1. Go to the class websiteOpen and do the Catalyst:Anatomy: Lesson 79- Catalyst #14-3/20-3/21ANDANATOMY: LESSON 79- Neuron Intro PPT-3/20-3/21

Semester 2 Table of Contents

20. Lesson 77- Clinical Diseases Pg. 65-6821. Lesson 78- Clinical Disease (2) Pg. 69-7022. Lesson 79- Neurons Intro Pg. 71-74

Assigned Vocabulary- Due: Next Th/Fri** Definition AND Picture**

27. Neuron28. Axon29. Dendrite30. Myelin sheath31. Nodes of Ranvier32. Axon terminal33. Axon hillock34. Soma35. Sensory neuron36. Motor neuron37. Interneuron

Announcements

• Flashcards Due: Next Th/Fri• Dissection Date Change: 4/7-4/8• Unit Test: 4/10-4/11• Notebook Check: 4/11

Neurons SQ3R- Pg.74

• Pg. 897-900 in bio book

Check It Out First

• https://www.youtube.com/watch?v=ob5U8zPbAX4

Get Ready for Notes: Pg. 72-73 Title: Neuron Introduction

What is a Neuron?

• Type of nerve cell that makes up the nervous system

• Humans have about 100 billion neurons!

Function of Neurons

• To carry electrical messages/signals from the brain to the rest of the body and back to the brain

3 Types of Neurons

1. Sensory Neuron- Sends signals to the central nervous system (senses)

2. Motor Neuron- sends signals away from the central nervous system

3. Interneuron- connects the different parts of the central nervous system together

https://www.youtube.com/watch?v=r5nMVAjz0d0

Dendrite Takes information to the cell body. Receives signals from other neurons.

dendrite

Soma (cell body)Part of the neuron that contains the nucleus.

soma

Organelle in the neuron that contains genetic material (DNA).

nucleus

Axon HillockLocated at the end of the cell body and controls the firing of the neuron (action potential).

axon hillock

axon

AxonTakes information or signals away from the cell body (ex. highway)

Myelin SheathFatty layer that surrounds some axons in order to conduct faster signals.

Myelin sheath

Node of RanvierGap in myelin sheath involved in sending messages.

Node of

Ranvier

Axon TerminalSends information to next step. Part of the neuron that releases neurotransmitters into the synaptic cleft.

Axon terminal

Neurotransmitters

• Chemicals that move across a small gap called the synapse that communicate a message to another neuron

Quick Check: What type of neuron sends this signal?

• You will have 15 seconds to choose which neuron you think does that job.

• You are going to write the name of the neuron: motor, sensory, interneuron.

• When I say go, you will show me which neuron type you think does that function.

Question 1

• The thalamus in the brain sends a signal to the occipital lobe in the brain.

1. Motor Neuron2. Sensory Neuron3. Interneuron

Question 2

• The chemoreceptors in the tongue taste a sour candy on your tongue.

1. Motor Neuron2. Sensory Neuron3. Interneuron

Question 3

• The brain stem sends a signal to the spinal cord.

1. Motor Neuron2. Sensory Neuron3. Interneuron

Question 4

• The spinal cord relays a signal from the brain to the bicep to pick up a heavy bag.

1. Motor Neuron2. Sensory Neuron3. Interneuron

Question 5

• The mechanoreceptor in the inner ear tells the brain you are listening to the new Drake song.

1. Motor Neuron2. Sensory Neuron3. Interneuron

Question 6

• The pain receptor in your gluteus maximus tells the brain that you are very sore from running.

1. Motor Neuron2. Sensory Neuron3. Interneuron

Question 7

• The hypothalamus in the brain sends a signal for your arms to sweat when it’s a really sunny day.

1. Motor Neuron2. Sensory Neuron3. Interneuron

Question 8

• These neurons are broken after his broken back injury, and Christopher Reeves, Superman, must now remain in a wheelchair.

1. Motor Neuron2. Sensory Neuron3. Interneuron

How it all works:Reflex Arc- involuntary and nearly instantaneous movement in response to a

stimulus

Whiteboard Expectations

1. Only write what is asked of you.2. Try every question.3. Take care of our materials.

Sample Question

• Draw a picture of Phineas Gage.

Whiteboards

#1

#2

dendrite

axon#3

nucleus

Whiteboard

Draw a neuron and label the dendrites and axon terminal.

Whiteboard

Imagine two neurons are sending a message to one another. The message is being sent from the (1) of the first neuron to the (2) of the second.

Whiteboards…

•Draw a neuron and label the ________________

Whiteboard

Explain how a message is sent across a neuron. Include as many vocabulary words as possible.

Whiteboard

Do all messages received by the dendrites get carried forward?

Whiteboard

Why is a neuron so differently shaped than the “typical” eukaryotic cell you imagine? Hint: form follows function

Whiteboard

What neuronal structure is really exaggerated in this cell?

How are you feeling about the parts of a neuron?

1 - 5

Practice Time- Pg.74