hormonal

electrical impulses

proteins

telegraph

all of the above

a nerve

spinal cord

brains

1 foot per second

150 meters per second

100 miles per hour

1 meter per second

1 year

100 years

1 month

10 years

multipolar neurons

pyramidal neurons

Purkinje neurons

bipolar neurons

stem cells

muscle cells

prison cells

glial cells

muscle cells

stem cells

liver cells

skin cells

they do not have a nucleus

they regenerate very quickly

they are very long compared to other cells in the body

they help carry oxygen to different parts of your body

muscle

the brain

nerve

wire