hormonal

telegraph

proteins

electrical impulses

1 month

1 year

10 years

100 years

they regenerate very quickly

they are very long compared to other cells in the body

they do not have a nucleus

they help carry oxygen to different parts of your body

all of the above

spinal cord

brains

a nerve

multipolar neurons

pyramidal neurons

bipolar neurons

Purkinje neurons

muscle cells

liver cells

stem cells

skin cells

150 meters per second

1 meter per second

1 foot per second

100 miles per hour

muscle

nerve

wire

the brain

prison cells

muscle cells

stem cells

glial cells