liver cells

stem cells

muscle cells

skin cells

muscle

the brain

wire

nerve

100 years

1 month

10 years

1 year

they are very long compared to other cells in the body

they regenerate very quickly

they do not have a nucleus

they help carry oxygen to different parts of your body

electrical impulses

hormonal

proteins

telegraph

bipolar neurons

multipolar neurons

Purkinje neurons

pyramidal neurons

glial cells

prison cells

stem cells

muscle cells

spinal cord

all of the above

a nerve

brains

1 meter per second

150 meters per second

1 foot per second

100 miles per hour