hormonal

telegraph

proteins

electrical impulses

all of the above

a nerve

spinal cord

brains

1 month

100 years

10 years

1 year

the brain

muscle

nerve

wire

liver cells

skin cells

stem cells

muscle cells

glial cells

prison cells

muscle cells

stem cells

pyramidal neurons

multipolar neurons

bipolar neurons

Purkinje neurons

100 miles per hour

150 meters per second

1 meter per second

1 foot per second

they are very long compared to other cells in the body

they regenerate very quickly

they do not have a nucleus

they help carry oxygen to different parts of your body