liver cells

stem cells

skin cells

muscle cells

they are very long compared to other cells in the body

they do not have a nucleus

they regenerate very quickly

they help carry oxygen to different parts of your body

proteins

hormonal

telegraph

electrical impulses

1 month

1 year

100 years

10 years

1 foot per second

1 meter per second

150 meters per second

100 miles per hour

bipolar neurons

pyramidal neurons

Purkinje neurons

multipolar neurons

spinal cord

a nerve

all of the above

brains

wire

muscle

nerve

the brain

glial cells

muscle cells

stem cells

prison cells