proteins

electrical impulses

hormonal

telegraph

all of the above

spinal cord

brains

a nerve

prison cells

glial cells

muscle cells

stem cells

1 meter per second

1 foot per second

150 meters per second

100 miles per hour

multipolar neurons

pyramidal neurons

bipolar neurons

Purkinje neurons

liver cells

stem cells

skin cells

muscle cells

10 years

1 year

100 years

1 month

they regenerate very quickly

they do not have a nucleus

they are very long compared to other cells in the body

they help carry oxygen to different parts of your body

muscle

nerve

wire

the brain