hormonal

telegraph

electrical impulses

proteins

multipolar neurons

pyramidal neurons

Purkinje neurons

bipolar neurons

spinal cord

a nerve

all of the above

brains

liver cells

muscle cells

skin cells

stem cells

100 years

10 years

1 year

1 month

100 miles per hour

1 foot per second

150 meters per second

1 meter per second

the brain

nerve

wire

muscle

muscle cells

stem cells

prison cells

glial cells

they regenerate very quickly

they do not have a nucleus

they help carry oxygen to different parts of your body

they are very long compared to other cells in the body