skin cells

stem cells

liver cells

muscle cells

10 years

100 years

1 year

1 month

stem cells

muscle cells

glial cells

prison cells

they regenerate very quickly

they are very long compared to other cells in the body

they do not have a nucleus

they help carry oxygen to different parts of your body

proteins

telegraph

electrical impulses

hormonal

bipolar neurons

Purkinje neurons

multipolar neurons

pyramidal neurons

spinal cord

all of the above

brains

a nerve

wire

muscle

nerve

the brain

100 miles per hour

150 meters per second

1 meter per second

1 foot per second