all of the above

a nerve

spinal cord

brains

stem cells

skin cells

muscle cells

liver cells

bipolar neurons

Purkinje neurons

multipolar neurons

pyramidal neurons

the brain

nerve

muscle

wire

muscle cells

prison cells

glial cells

stem cells

they are very long compared to other cells in the body

they do not have a nucleus

they regenerate very quickly

they help carry oxygen to different parts of your body

1 meter per second

150 meters per second

1 foot per second

100 miles per hour

telegraph

hormonal

electrical impulses

proteins

1 month

1 year

10 years

100 years