Nervous System

telegraph

electrical impulses

proteins

hormonal

stem cells

muscle cells

skin cells

liver cells

pyramidal neurons

bipolar neurons

Purkinje neurons

multipolar neurons

glial cells

muscle cells

stem cells

prison cells

spinal cord

a nerve

all of the above

brains

muscle

nerve

wire

the brain

100 years

10 years

1 year

1 month

they regenerate very quickly

they are very long compared to other cells in the body

they help carry oxygen to different parts of your body

they do not have a nucleus

150 meters per second

1 foot per second

100 miles per hour

1 meter per second