they regenerate very quickly

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

telegraph

hormonal

proteins

electrical impulses

100 years

1 year

10 years

1 month

stem cells

glial cells

prison cells

muscle cells

150 meters per second

1 meter per second

100 miles per hour

1 foot per second

pyramidal neurons

multipolar neurons

Purkinje neurons

bipolar neurons

spinal cord

a nerve

all of the above

brains

muscle cells

stem cells

skin cells

liver cells

the brain

muscle

wire

nerve