electrical impulses

telegraph

proteins

hormonal

liver cells

stem cells

muscle cells

skin cells

1 month

1 year

10 years

100 years

prison cells

stem cells

muscle cells

glial cells

1 foot per second

1 meter per second

150 meters per second

100 miles per hour

spinal cord

all of the above

a nerve

brains

they help carry oxygen to different parts of your body

they regenerate very quickly

they do not have a nucleus

they are very long compared to other cells in the body

pyramidal neurons

bipolar neurons

Purkinje neurons

multipolar neurons

the brain

nerve

wire

muscle