liver cells

skin cells

muscle cells

stem cells

telegraph

hormonal

electrical impulses

proteins

10 years

100 years

1 year

1 month

wire

the brain

muscle

nerve

bipolar neurons

multipolar neurons

pyramidal neurons

Purkinje neurons

1 meter per second

150 meters per second

1 foot per second

100 miles per hour

prison cells

muscle cells

stem cells

glial cells

all of the above

spinal cord

a nerve

brains

they help carry oxygen to different parts of your body

they do not have a nucleus

they regenerate very quickly

they are very long compared to other cells in the body