stem cells

muscle cells

liver cells

skin cells

they do not have a nucleus

they are very long compared to other cells in the body

they help carry oxygen to different parts of your body

they regenerate very quickly

telegraph

proteins

electrical impulses

hormonal

10 years

1 month

100 years

1 year

bipolar neurons

multipolar neurons

pyramidal neurons

Purkinje neurons

1 meter per second

100 miles per hour

150 meters per second

1 foot per second

brains

spinal cord

a nerve

all of the above

nerve

wire

the brain

muscle

stem cells

prison cells

glial cells

muscle cells