150 meters per second

100 miles per hour

1 meter per second

1 foot per second

they regenerate very quickly

they do not have a nucleus

they help carry oxygen to different parts of your body

they are very long compared to other cells in the body

the brain

wire

nerve

muscle

spinal cord

all of the above

a nerve

brains

multipolar neurons

bipolar neurons

pyramidal neurons

Purkinje neurons

stem cells

muscle cells

liver cells

skin cells

1 year

100 years

1 month

10 years

telegraph

hormonal

electrical impulses

proteins

prison cells

stem cells

muscle cells

glial cells