telegraph

electrical impulses

hormonal

proteins

spinal cord

a nerve

all of the above

brains

stem cells

glial cells

prison cells

muscle cells

10 years

100 years

1 year

1 month

they do not have a nucleus

they are very long compared to other cells in the body

they regenerate very quickly

they help carry oxygen to different parts of your body

muscle cells

stem cells

liver cells

skin cells

wire

the brain

muscle

nerve

Purkinje neurons

multipolar neurons

bipolar neurons

pyramidal neurons

1 foot per second

1 meter per second

150 meters per second

100 miles per hour