stem cells

muscle cells

skin cells

liver cells

they do not have a nucleus

they regenerate very quickly

they are very long compared to other cells in the body

they help carry oxygen to different parts of your body

brains

all of the above

spinal cord

a nerve

100 miles per hour

1 foot per second

150 meters per second

1 meter per second

100 years

1 month

10 years

1 year

telegraph

electrical impulses

proteins

hormonal

muscle cells

glial cells

stem cells

prison cells

bipolar neurons

pyramidal neurons

Purkinje neurons

multipolar neurons

muscle

the brain

nerve

wire