telegraph

electrical impulses

hormonal

proteins

100 miles per hour

150 meters per second

1 meter per second

1 foot per second

stem cells

glial cells

prison cells

muscle cells

100 years

1 month

1 year

10 years

stem cells

skin cells

liver cells

muscle cells

a nerve

spinal cord

brains

all of the above

multipolar neurons

bipolar neurons

Purkinje neurons

pyramidal neurons

the brain

nerve

muscle

wire

they do not have a nucleus

they regenerate very quickly

they help carry oxygen to different parts of your body

they are very long compared to other cells in the body