telegraph

hormonal

proteins

electrical impulses

the brain

muscle

nerve

wire

spinal cord

brains

a nerve

all of the above

10 years

1 month

1 year

100 years

muscle cells

prison cells

stem cells

glial cells

they help carry oxygen to different parts of your body

they regenerate very quickly

they are very long compared to other cells in the body

they do not have a nucleus

Purkinje neurons

multipolar neurons

pyramidal neurons

bipolar neurons

muscle cells

skin cells

liver cells

stem cells

1 meter per second

150 meters per second

1 foot per second

100 miles per hour