liver cells

muscle cells

skin cells

stem cells

1 meter per second

1 foot per second

100 miles per hour

150 meters per second

telegraph

hormonal

proteins

electrical impulses

nerve

wire

muscle

the brain

they do not have a nucleus

they are very long compared to other cells in the body

they help carry oxygen to different parts of your body

they regenerate very quickly

100 years

10 years

1 year

1 month

pyramidal neurons

bipolar neurons

Purkinje neurons

multipolar neurons

spinal cord

brains

all of the above

a nerve

glial cells

muscle cells

stem cells

prison cells