L5 - Nerves Check-In Part 2

Nerves are made of 2 main tissues.

What 2 tissues are blended together to create a Nerve?

• Neurons

• Blood Vessels

• Muscle Fibers

• Spinal Cords

• Bone Fragments

Tags

NGSS.MS-LS1-3

A neuron's job is to send an electrical signal called an ​ (a)   . They can move as ​ (b)   as a train or as ​ (c)   as you walk.

• impulse
• fast
• slow
• message
• gradually
• shock

Tags

NGSS.MS-LS1-2

Sort the Neuron Facts by True or False.

Groups:

(a) True

,

(b) False

• Neurons are very long lived cells

• Neurons all do the same things

• Neurons only use a little bit of energy

• Neurons are all shaped the same

• Neurons are NOT easily replaceable

Label the different parts of the Neuron

a

b

c

d

e

Axon

Synapse

Cell Body

Dendrites

Myelin

Match the different parts of a Neuron to their jobs.

• Cell Body

• Fat coat that makes signals faster

• Dendrites

• The gap between Neurons where signals are sent as chemicals

• Myelin

• Long arm that sends the signal

• Axon

• The main part of the cell

• Synapse

• Listeners. Pick up signals from other cells

Tags

NGSS.MS-LS1-2

Nerves work by sending signals down a chain or neurons.

When there are many neurons in a chain the signal moves more ​ (a)  

When there are few neurons in a chain the signal moves more ​ (b)  

• slowly
• quickly

Nerves work by sending signals down a chain or neurons.

When there is a ​ (a)   gap between neurons in a chain the signal can move.

When there is a​ ​ (b)   gap between neurons in a chain the signal may not send.

• small
• large

During our Nerve Speed experiment we discovered that large gaps in a neuron chain can disrupt or stop signals going to and from the brain.

How does this relate to the injured foot?

• He couldn't feel his foot because the cut stopped the blood flow and it got cold.

• He felt pain because when he broke his bones it made the nerve signal stronger.

• When he cut his foot, it might have damaged his nerve and made a gap which is why he couldn't feel it.

• When he hurt his foot it didn't affect any of the signals in his foot.

Tags

NGSS.MS-LS1-2

NGSS.MS-LS1-3

What did we find out when we did our nerve sensitivity experiment with the paperclips?

• We discovered that paperclips can measure temperature sensitivity.
• We found that the paperclips can cause pain when pressed against the skin.
• We learned that all areas of the skin are equally sensitive.
• We found that some areas of the skin were more sensitive to touch than others

Tags

NGSS.MS-LS1-3

What is one reasonable hypothesis for why some parts of your skin are more sensitive than others?

• Some parts of your skin are thicker than others.
• All skin has the same sensitivity.
• Sensitivity is determined by skin color.
• Some parts of your skin have more nerve endings, making them more sensitive.