hormonal

proteins

telegraph

electrical impulses

10 years

1 month

100 years

1 year

nerve

muscle

wire

the brain

muscle cells

glial cells

prison cells

stem cells

they regenerate very quickly

they help carry oxygen to different parts of your body

they do not have a nucleus

they are very long compared to other cells in the body

150 meters per second

1 foot per second

1 meter per second

100 miles per hour

a nerve

all of the above

brains

spinal cord

multipolar neurons

pyramidal neurons

Purkinje neurons

bipolar neurons

muscle cells

liver cells

stem cells

skin cells