skin cells

stem cells

muscle cells

liver cells

proteins

hormonal

electrical impulses

telegraph

muscle

wire

nerve

the brain

they regenerate very quickly

they help carry oxygen to different parts of your body

they are very long compared to other cells in the body

they do not have a nucleus

stem cells

muscle cells

prison cells

glial cells

all of the above

spinal cord

a nerve

brains

10 years

100 years

1 year

1 month

pyramidal neurons

multipolar neurons

bipolar neurons

Purkinje neurons

1 foot per second

100 miles per hour

150 meters per second

1 meter per second