telegraph

electrical impulses

proteins

hormonal

150 meters per second

1 meter per second

100 miles per hour

1 foot per second

muscle cells

prison cells

glial cells

stem cells

a nerve

brains

all of the above

spinal cord

they are very long compared to other cells in the body

they help carry oxygen to different parts of your body

they regenerate very quickly

they do not have a nucleus

Purkinje neurons

bipolar neurons

multipolar neurons

pyramidal neurons

muscle cells

skin cells

stem cells

liver cells

muscle

nerve

the brain

wire

1 month

100 years

1 year

10 years