telegraph

electrical impulses

hormonal

proteins

spinal cord

all of the above

a nerve

brains

they regenerate very quickly

they are very long compared to other cells in the body

they do not have a nucleus

they help carry oxygen to different parts of your body

pyramidal neurons

Purkinje neurons

bipolar neurons

multipolar neurons

skin cells

liver cells

muscle cells

stem cells

1 meter per second

100 miles per hour

150 meters per second

1 foot per second

glial cells

prison cells

stem cells

muscle cells

the brain

wire

nerve

muscle

1 year

10 years

1 month

100 years