the brain

muscle

nerve

wire

stem cells

muscle cells

glial cells

prison cells

they regenerate very quickly

they do not have a nucleus

they help carry oxygen to different parts of your body

they are very long compared to other cells in the body

bipolar neurons

pyramidal neurons

Purkinje neurons

multipolar neurons

brains

all of the above

a nerve

spinal cord

100 miles per hour

1 foot per second

150 meters per second

1 meter per second

hormonal

telegraph

proteins

electrical impulses

1 month

100 years

10 years

1 year

stem cells

skin cells

liver cells

muscle cells