telegraph

electrical impulses

hormonal

proteins

1 meter per second

100 miles per hour

150 meters per second

1 foot per second

liver cells

skin cells

stem cells

muscle cells

a nerve

all of the above

spinal cord

brains

muscle cells

stem cells

prison cells

glial cells

bipolar neurons

pyramidal neurons

Purkinje neurons

multipolar neurons

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

1 month

100 years

10 years

1 year

the brain

muscle

nerve

wire