spinal cord

a nerve

all of the above

brains

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

stem cells

muscle cells

glial cells

prison cells

1 month

10 years

1 year

100 years

telegraph

hormonal

proteins

electrical impulses

bipolar neurons

pyramidal neurons

multipolar neurons

Purkinje neurons

wire

nerve

the brain

muscle

1 meter per second

1 foot per second

150 meters per second

100 miles per hour

muscle cells

stem cells

skin cells

liver cells