Neurons

Question 1

What is a ? What is a nerve?

Answer 1

• Neuron is an individual nerve cell
• Neuron = “ building block” of nervous system because the entire system is made of neurons

Question 2

1. Sensory neurons

Answer 2

Pick up info from your senses to send to your brain

Sensory
Recepter—–> CNS

Question 3

2. Interneurons ( relay neurons)

Answer 3

• only found in CNS

Relay
CNS —> CNS

Question 4

3. Motor neurons

Answer 4

• Move your muscles/ organs/glands

Question 5

be able to draw/ label and function of :

Dendrite

Answer 5

Receives info from other neurons and transmits it to the soma.

Question 6

be able to draw/ label and function of :

Soma

Answer 6

Also known as the cell body. This contains the nucleus and maintains the neuron and keeps it functioning.

Question 7

be able to draw/ label and function of :

Axon

Answer 7

This thin tube- like extension that transmits information from the soma to the axon terminal.
The space between two neurons.

Question 8

be able to draw/ label and function of :

Axon terminal

Answer 8

Found at the end of axons, this small structure stores and secretes NEUROTRANSMITTERS.

Question 9

be able to draw/ label and function of :

Myelin

Answer 9

• A white fatty substance that coats the axon
• This insulates the axon and allows the message to pass faster along the axon.

Question 10

be able to draw/ label and function of :

Synaptic gap

Answer 10

the space between tow neurons

trannsmitions from one neuron to another

Question 11

Labke the synapotic gap

Question 12

be able to draw/ label and function of :

What direction is the electrical impulse ?

Question 13

Neurotransmitters
and their types

Answer 13

Are chemicals that neurons used to communicate with each other

Types:
- Adrenaline ( FFF)
- dopamine ( pleasure)
- Serotonin ( mood)

Question 14

How are excitatory and inhibitory neurotransmitters different?

Answer 14

Excitatory: “ gas pedal”
- Increase likelihood that a neuron will fire and electrical signal
- leading to actions or reactions in the body

Inhibitory: “brake” “slow down”
- decrease likelhood that a neuron will fire
- helps to calm brain and reduce activity

Question 15

Why are neuron messages referred to as electrochemical?

Answer 15

Electrochemical = Neuron messages involve both electrical & chemical proccesses.

• Inside neuron the message is Electrical (IMPLUSE)
• and outside the neuron message is in chemical form ( neurotransmiiters)