all of the above

spinal cord

a nerve

brains

1 month

1 year

10 years

100 years

telegraph

hormonal

proteins

electrical impulses

liver cells

muscle cells

skin cells

stem cells

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

they do not have a nucleus

wire

muscle

nerve

the brain

multipolar neurons

bipolar neurons

pyramidal neurons

Purkinje neurons

100 miles per hour

150 meters per second

1 meter per second

1 foot per second

prison cells

muscle cells

glial cells

stem cells