telegraph

hormonal

proteins

electrical impulses

100 miles per hour

150 meters per second

1 foot per second

1 meter per second

prison cells

glial cells

muscle cells

stem cells

liver cells

skin cells

muscle cells

stem cells

multipolar neurons

Purkinje neurons

pyramidal neurons

bipolar neurons

they help carry oxygen to different parts of your body

they regenerate very quickly

they do not have a nucleus

they are very long compared to other cells in the body

the brain

nerve

muscle

wire

brains

all of the above

spinal cord

a nerve

1 year

10 years

1 month

100 years