brains

all of the above

a nerve

spinal cord

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

muscle cells

liver cells

stem cells

skin cells

10 years

1 year

100 years

1 month

telegraph

proteins

electrical impulses

hormonal

bipolar neurons

pyramidal neurons

multipolar neurons

Purkinje neurons

nerve

wire

the brain

muscle

1 meter per second

100 miles per hour

150 meters per second

1 foot per second

glial cells

muscle cells

stem cells

prison cells