a nerve

brains

all of the above

spinal cord

100 miles per hour

150 meters per second

1 meter per second

1 foot per second

stem cells

muscle cells

skin cells

liver cells

10 years

1 year

1 month

100 years

electrical impulses

telegraph

hormonal

proteins

bipolar neurons

multipolar neurons

pyramidal neurons

Purkinje neurons

muscle

wire

the brain

nerve

stem cells

prison cells

glial cells

muscle 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