wire

nerve

the brain

muscle

proteins

hormonal

electrical impulses

telegraph

1 meter per second

1 foot per second

100 miles per hour

150 meters per second

skin cells

liver cells

stem cells

muscle cells

100 years

1 year

1 month

10 years

brains

spinal cord

all of the above

a nerve

they help carry oxygen to different parts of your body

they regenerate very quickly

they are very long compared to other cells in the body

they do not have a nucleus

prison cells

glial cells

muscle cells

stem cells

pyramidal neurons

bipolar neurons

Purkinje neurons

multipolar neurons