all of the above

a nerve

brains

spinal cord

proteins

electrical impulses

telegraph

hormonal

100 miles per hour

1 foot per second

150 meters per second

1 meter per second

muscle cells

stem cells

liver cells

skin cells

multipolar neurons

Purkinje neurons

pyramidal neurons

bipolar neurons

they are very long compared to other cells in the body

they do not have a nucleus

they help carry oxygen to different parts of your body

they regenerate very quickly

the brain

nerve

wire

muscle

muscle cells

stem cells

glial cells

prison cells

1 year

1 month

100 years

10 years