liver cells

stem cells

skin cells

muscle cells

1 foot per second

1 meter per second

100 miles per hour

150 meters per second

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

spinal cord

brains

a nerve

all of the above

proteins

hormonal

telegraph

electrical impulses

Purkinje neurons

pyramidal neurons

multipolar neurons

bipolar neurons

stem cells

prison cells

glial cells

muscle cells

100 years

10 years

1 month

1 year

nerve

the brain

wire

muscle