they regenerate very quickly

they help carry oxygen to different parts of your body

they are very long compared to other cells in the body

they do not have a nucleus

100 years

1 year

1 month

10 years

electrical impulses

proteins

hormonal

telegraph

a nerve

brains

all of the above

spinal cord

liver cells

skin cells

muscle cells

stem cells

bipolar neurons

pyramidal neurons

Purkinje neurons

multipolar neurons

wire

muscle

nerve

the brain

glial cells

prison cells

stem cells

muscle cells

100 miles per hour

150 meters per second

1 foot per second

1 meter per second