electrical impulses

telegraph

hormonal

proteins

they help carry oxygen to different parts of your body

they do not have a nucleus

they regenerate very quickly

they are very long compared to other cells in the body

all of the above

brains

a nerve

spinal cord

100 miles per hour

1 foot per second

1 meter per second

150 meters per second

multipolar neurons

bipolar neurons

pyramidal neurons

Purkinje neurons

1 month

10 years

1 year

100 years

nerve

wire

the brain

muscle

muscle cells

glial cells

stem cells

prison cells

liver cells

muscle cells

skin cells

stem cells