proteins

hormonal

electrical impulses

telegraph

they help carry oxygen to different parts of your body

they do not have a nucleus

they are very long compared to other cells in the body

they regenerate very quickly

liver cells

skin cells

stem cells

muscle cells

stem cells

glial cells

prison cells

muscle cells

10 years

1 month

100 years

1 year

nerve

wire

the brain

muscle

150 meters per second

1 meter per second

100 miles per hour

1 foot per second

brains

all of the above

spinal cord

a nerve

pyramidal neurons

bipolar neurons

Purkinje neurons

multipolar neurons