telegraph

electrical impulses

proteins

hormonal

100 miles per hour

150 meters per second

1 foot per second

1 meter per second

a nerve

all of the above

spinal cord

brains

they are very long compared to other cells in the body

they do not have a nucleus

they help carry oxygen to different parts of your body

they regenerate very quickly

stem cells

muscle cells

liver cells

skin cells

10 years

1 month

1 year

100 years

prison cells

stem cells

muscle cells

glial cells

wire

the brain

muscle

nerve

pyramidal neurons

Purkinje neurons

multipolar neurons

bipolar neurons