telegraph

hormonal

electrical impulses

proteins

a nerve

brains

spinal cord

all of the above

liver cells

stem cells

skin cells

muscle cells

1 meter per second

150 meters per second

100 miles per hour

1 foot per second

they are very long compared to other cells in the body

they regenerate very quickly

they help carry oxygen to different parts of your body

they do not have a nucleus

Purkinje neurons

bipolar neurons

pyramidal neurons

multipolar neurons

100 years

1 month

1 year

10 years

muscle

nerve

wire

the brain

stem cells

prison cells

glial cells

muscle cells