electrical impulses

telegraph

hormonal

proteins

they do not have a nucleus

they regenerate very quickly

they help carry oxygen to different parts of your body

they are very long compared to other cells in the body

brains

a nerve

all of the above

spinal cord

wire

nerve

the brain

muscle

1 year

100 years

1 month

10 years

150 meters per second

100 miles per hour

1 foot per second

1 meter per second

multipolar neurons

pyramidal neurons

Purkinje neurons

bipolar neurons

prison cells

muscle cells

glial cells

stem cells

stem cells

liver cells

skin cells

muscle cells