electrical impulses

telegraph

hormonal

proteins

stem cells

skin cells

muscle cells

liver cells

100 years

1 month

1 year

10 years

100 miles per hour

1 meter per second

1 foot per second

150 meters per second

muscle

the brain

nerve

wire

all of the above

a nerve

spinal cord

brains

bipolar neurons

pyramidal neurons

multipolar neurons

Purkinje neurons

stem cells

muscle cells

prison cells

glial cells

they regenerate very quickly

they do not have a nucleus

they help carry oxygen to different parts of your body

they are very long compared to other cells in the body