telegraph

electrical impulses

hormonal

proteins

1 month

100 years

1 year

10 years

stem cells

liver cells

skin cells

muscle cells

wire

muscle

nerve

the brain

bipolar neurons

Purkinje neurons

pyramidal neurons

multipolar neurons

spinal cord

a nerve

brains

all of the above

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

1 foot per second

100 miles per hour

1 meter per second

150 meters per second

prison cells

stem cells

muscle cells

glial cells