telegraph

electrical impulses

hormonal

proteins

all of the above

brains

spinal cord

a nerve

nerve

muscle

the brain

wire

they do not have a nucleus

they help carry oxygen to different parts of your body

they regenerate very quickly

they are very long compared to other cells in the body

glial cells

stem cells

muscle cells

prison cells

pyramidal neurons

Purkinje neurons

multipolar neurons

bipolar neurons

skin cells

liver cells

stem cells

muscle cells

1 year

100 years

10 years

1 month

1 foot per second

100 miles per hour

1 meter per second

150 meters per second