Intro To Nervous System Flashcards
How many neurons does the cerebellum have
70 billion
How many neurons does the spinal cord have
1 billion
What is a neuron
A nerve cell
Basic building block of the nervous system
What is a dendrite
Branching extensions that receive messages and send impulses toward the cell body
What is an axon
Extension of a neuron ending in branching fibres through which messages are sent to other neurons/ muscles/ glands
What’s the mylin sheath
Layer of fatty cells encasing many neurons
Increases transmission speed
What are the 3 main types of neuron
Multipolar (motor neuron, interneuron)
Unipolar (sensory neuron)
Bipolar (sensory neuron)
What’s the phospholipid bilayer
Fatty acids between 2 slices of polar (phosphate) bread
What’s the phospholipid bilayer used for
Detect substances
Control access
Transport
What’s passive propagation
Getting smaller as they go
What’s active propagation
Maintaining intensity
What does the cell membrane control?
The environment
Selective permeability
