telegraph

hormonal

electrical impulses

proteins

1 year

1 month

10 years

100 years

a nerve

all of the above

spinal cord

brains

they are very long compared to other cells in the body

they regenerate very quickly

they do not have a nucleus

they help carry oxygen to different parts of your body

liver cells

skin cells

muscle cells

stem cells

prison cells

stem cells

glial cells

muscle cells

1 meter per second

150 meters per second

1 foot per second

100 miles per hour

muscle

nerve

the brain

wire

Purkinje neurons

pyramidal neurons

bipolar neurons

multipolar neurons