telegraph

proteins

hormonal

electrical impulses

Purkinje neurons

pyramidal neurons

bipolar neurons

multipolar neurons

brains

all of the above

spinal cord

a nerve

liver cells

muscle cells

skin cells

stem cells

glial cells

stem cells

prison cells

muscle cells

100 miles per hour

1 meter per second

1 foot per second

150 meters per second

muscle

nerve

wire

the brain

they do not have a nucleus

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

1 year

10 years

100 years

1 month