100 miles per hour

150 meters per second

1 meter per second

1 foot per second

telegraph

electrical impulses

hormonal

proteins

skin cells

stem cells

muscle cells

liver 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

muscle

wire

nerve

the brain

pyramidal neurons

bipolar neurons

multipolar neurons

Purkinje neurons

1 month

100 years

1 year

10 years

prison cells

muscle cells

stem cells

glial cells

all of the above

spinal cord

a nerve

brains