electrical impulses

hormonal

proteins

telegraph

they are very long compared to other cells in the body

they regenerate very quickly

they do not have a nucleus

they help carry oxygen to different parts of your body

100 years

1 year

10 years

1 month

brains

a nerve

all of the above

spinal cord

1 foot per second

100 miles per hour

1 meter per second

150 meters per second

skin cells

stem cells

muscle cells

liver cells

glial cells

muscle cells

stem cells

prison cells

bipolar neurons

pyramidal neurons

Purkinje neurons

multipolar neurons

muscle

nerve

wire

the brain