Nervous System

hormonal

telegraph

electrical impulses

proteins

all of the above

brains

spinal cord

a nerve

1 month

100 years

10 years

1 year

muscle cells

liver cells

stem cells

skin cells

muscle

nerve

wire

the brain

1 foot per second

100 miles per hour

150 meters per second

1 meter per second

Purkinje neurons

multipolar neurons

bipolar neurons

pyramidal neurons

stem cells

glial cells

muscle cells

prison cells

they help carry oxygen to different parts of your body

they do not have a nucleus

they are very long compared to other cells in the body

they regenerate very quickly