hormonal

telegraph

electrical impulses

proteins

1 meter per second

100 miles per hour

1 foot per second

150 meters per second

stem cells

muscle cells

prison cells

glial cells

1 year

1 month

100 years

10 years

multipolar neurons

pyramidal neurons

Purkinje neurons

bipolar neurons

brains

all of the above

spinal cord

a nerve

nerve

wire

muscle

the brain

stem cells

muscle cells

skin cells

liver cells

they regenerate very quickly

they are very long compared to other cells in the body

they help carry oxygen to different parts of your body

they do not have a nucleus