proteins

electrical impulses

telegraph

hormonal

muscle cells

glial cells

stem cells

prison cells

muscle cells

liver cells

skin cells

stem cells

they are very long compared to other cells in the body

they do not have a nucleus

they regenerate very quickly

they help carry oxygen to different parts of your body

150 meters per second

100 miles per hour

1 foot per second

1 meter per second

10 years

1 year

100 years

1 month

nerve

wire

muscle

the brain

spinal cord

brains

all of the above

a nerve

pyramidal neurons

Purkinje neurons

bipolar neurons

multipolar neurons