they help carry oxygen to different parts of your body

they do not have a nucleus

they regenerate very quickly

they are very long compared to other cells in the body

hormonal

telegraph

proteins

electrical impulses

100 years

1 year

1 month

10 years

stem cells

prison cells

glial cells

muscle cells

pyramidal neurons

Purkinje neurons

bipolar neurons

multipolar neurons

all of the above

brains

spinal cord

a nerve

stem cells

skin cells

muscle cells

liver cells

100 miles per hour

1 foot per second

150 meters per second

1 meter per second

muscle

wire

nerve

the brain