a nerve

brains

spinal cord

all of the above

proteins

telegraph

electrical impulses

hormonal

stem cells

liver cells

skin cells

muscle cells

100 miles per hour

150 meters per second

1 foot per second

1 meter per second

100 years

1 year

10 years

1 month

the brain

wire

nerve

muscle

stem cells

glial cells

prison cells

muscle cells

pyramidal neurons

multipolar neurons

Purkinje neurons

bipolar neurons

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

they do not have a nucleus