29.2 neurons set up cornell notes on pg. 31 topic: 29.2 nervous system and neurons essential...

29.2 Neurons Set up Cornell Notes on pg. 31

•Topic: 29.2 Nervous System and Neurons

•Essential Question(s):

1.Draw and label a neuron on pg. 46 in picture bubble map format.

2.1 Atoms, Ions, and Molecules

29.1-2 Nervous System and Neurons

KEY CONCEPT The nervous system provides the

means by which organ systems communicate and is composed of highly specialized cells.

29.2 Neurons

KEY CONCEPT The nervous system provides one of the means by which organ systems communicate.

29.2 Neurons

• The nervous system controls thoughts, movement, and emotion as well as simpler life processes such as swallowing

29.2 Neurons

• The nervous system works quickly, using chemical and electrical signals.– interconnected network of cells (hardwired)– signals move through cells (neurons)– divided into central nervous system (CNS) and

peripheral nervous system (PNS)- CNS- brain and spinal cord- PNS-network of nerves that transmit messages to and from the

PNS to the CNS

spinal chord

nerves

29.2 Neurons

KEY CONCEPT The nervous system is composed of highly specialized cells.

29.2 Neurons

Cell body

Dendrites

axon

Neurons (aka nerve cells) are cells that can store information and send and receive messages within the nervous system.

• Make up an information network (Like the internet)

neurotransmitter

29.2 Neurons

A Closer Look at Neurons (4m53s)

29.2 Neurons

Neurons are highly specialized cells.

• A neuron has three parts.

1. cell body has nucleus and organelles

1 Cell body

29.2 Neurons

2. dendrites receive messages from neighboring cells




2 dendrites

29.2 Neurons

3 axon

2. dendrites receive messages from neighboring cells




3. axon carries messages to other cells

Specialized support cells- such as the myelin sheath- insulate neurons’ axons and helps them send messages

29.2 Neurons Directions: Please make a picture bubble map of this neuron. Use p. 876-879 in your book to help you. Label all major parts of a neuron (cell body, dendrites, axon, myelin sheath, axon terminals, action potential, synapse, neurotransmitters). Once all parts are labeled, you need to describe the function of each.

29.2 Neurons

Synapse

Synapse: Gaps between neurons

29.2 Neurons

Neurotransmitters

Neurotransmitters: Chemical signals released by neurons. Carry information from neuron to neuron.

29.2 Neurons

Dendrites receive action potential

Action Potential: Electrical impulse that carries messages

29.2 Neurons

NEURON

29.2 Neurons

Dendrites of next neuron

NEURON

29.2 Neurons

Dendrites of next neuron

Synapse (gap)

Axon terminal

Axon terminal: releases neurotransmitters (chemical signals)

29.2 Neurons

Cell body

Dendrites

Check your labels:

axon

Myelin sheath

Axon terminal

NEURON

Action potential

Neurotransmitters

Synapse

29.2 Neurons

Neurons transmit information in the form of electrical and chemical impulses

1. When a neuron is stimulated, it produces an electrical signal (action potential) within that neuron- Electrical Impulse reaches axon terminal

29.2 Neurons

synapse

neurotransmitter

receptorvesicles

2. Before it can move to the next cell it changes into a chemical signal (neurotransmitter)

3. Neurotransmitters (chemicals) release into synapse.

4. Neurotransmitters stimulate next cell.

29.2 Neurons

Neurons and Sensory Neurons (2m59s)

29.2 Neurons

How does the structure of a neuron make it effective in carrying out the functions of the nervous system?

29.2 Neurons

How does the structure of a neuron make it effective in carrying out the functions of the nervous system?

Neurons have long extensions called axons, which allow messages to be carried long distances without having to pass the signal to another cell.

29.2 Neurons Set up Cornell Notes on pg. 33

•Topic: 29.2 Types of Neurons

•Essential Question(s):

1.None.

2.1 Atoms, Ions, and Molecules

29.2 Types of Neurons

29.2 Neurons

How the Nervous System Works (1m59s)

29.2 Neurons

There are 3 types of neurons:

1)Sensory neurons

2)Interneurons

3)Motor neurons

29.2 Neurons

34

1. Sensory Neurons: (Think Senses)• Function: Sensory receptors gather information

from external/ internal environment and carry impulses along sensory neurons to the CNS

• NO INTERPRETATION• Located in PNS

Outside:Light &SoundIntensities

Inside:TemperatureOxygen LevelspH Levels

29.2 Neurons

35

2)Interneurons:• Function: Receives signals from sensory neurons and

processes and interprets these messages within the CNS

• Makes decisions on what needs to be done• Sends messages/instructions to motor neurons• Located in CNS

29.2 Neurons

36

3)Motor neurons: •Function: Carry nerve impulses out of the brain or spinal cord to effectors

•Effectors: muscles and glands will execute a specific task•Located in the PNS.

29.2 Neurons

Motor Neurons (57s)

29.2 Neurons

38

2. ________________

3. ______________

4. _____________

1._______________

5._____________

Key: Motor Neurons Effectors Receptors Sensory Neurons Interneurons

Draw/label on p. 33

29.2 Neurons

39

2. Sensory Neurons

3. Interneurons

4. Motor Neurons

1. Receptors

5. Effectors


29.2 Neurons

40

1. 2.


3.

4.

5.

29.2 Neurons

Stimuli and Neurons (4m 16s)

29.2 Neurons

42

• The nervous system can:• Detect changes in the body• Make decisions based on the info received • Stimulate muscles and/or glands to respond• Counteract changes to maintain homeostasis

In a nutshell….

29.2 Neurons

Give a real life example (Tell a story)

Draw a picture for each

43

Types of Neurons “Story” Tree Map (P. 32)

Sensory Neurons Interneurons Motor Neurons

1. The phone rings. The sensory neurons in your ear gather the sound information and send it to the CNS

2. Your brain interprets this information and identifies the sound as the phone ringing. This info is sent to the motor neurons

3. The motor neurons send nerve impulses to your muscles which allow you to answer the phone

• Function • Location



29.2 neurons set up cornell notes on pg. 31 topic: 29.2 nervous system and neurons essential...

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