telegraph

electrical impulses

hormonal

proteins

muscle cells

stem cells

liver cells

skin cells

1 year

100 years

10 years

1 month

1 meter per second

100 miles per hour

150 meters per second

1 foot per second

prison cells

stem cells

muscle cells

glial cells

a nerve

all of the above

spinal cord

brains

pyramidal neurons

bipolar neurons

Purkinje neurons

multipolar neurons

they help carry oxygen to different parts of your body

they are very long compared to other cells in the body

they regenerate very quickly

they do not have a nucleus

the brain

muscle

wire

nerve