hormonal

proteins

telegraph

electrical impulses

all of the above

spinal cord

a nerve

brains

prison cells

muscle cells

stem cells

glial cells

they do not have a nucleus

they help carry oxygen to different parts of your body

they are very long compared to other cells in the body

they regenerate very quickly

muscle

wire

nerve

the brain

Purkinje neurons

multipolar neurons

pyramidal neurons

bipolar neurons

100 miles per hour

1 foot per second

150 meters per second

1 meter per second

1 year

100 years

10 years

1 month

stem cells

skin cells

liver cells

muscle cells