proteins

hormonal

telegraph

electrical impulses

brains

spinal cord

all of the above

a nerve

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

muscle cells

stem cells

glial cells

prison cells

multipolar neurons

Purkinje neurons

bipolar neurons

pyramidal neurons

the brain

muscle

nerve

wire

1 month

1 year

100 years

10 years

100 miles per hour

1 meter per second

1 foot per second

150 meters per second

muscle cells

skin cells

stem cells

liver cells