stem cells

prison cells

glial cells

muscle cells

they do not have a nucleus

they regenerate very quickly

they help carry oxygen to different parts of your body

they are very long compared to other cells in the body

1 month

1 year

100 years

10 years

all of the above

spinal cord

brains

a nerve

telegraph

proteins

hormonal

electrical impulses

liver cells

skin cells

stem cells

muscle cells

pyramidal neurons

bipolar neurons

Purkinje neurons

multipolar neurons

nerve

wire

muscle

the brain

150 meters per second

100 miles per hour

1 meter per second

1 foot per second