liver cells

skin cells

muscle cells

stem cells

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

they regenerate very quickly

proteins

electrical impulses

hormonal

telegraph

brains

a nerve

spinal cord

all of the above

multipolar neurons

bipolar neurons

Purkinje neurons

pyramidal neurons

muscle cells

stem cells

prison cells

glial cells

1 meter per second

1 foot per second

150 meters per second

100 miles per hour

10 years

1 month

1 year

100 years

wire

muscle

the brain

nerve