telegraph

hormonal

electrical impulses

proteins

bipolar neurons

pyramidal neurons

Purkinje neurons

multipolar neurons

150 meters per second

1 foot per second

1 meter per second

100 miles per hour

nerve

the brain

muscle

wire

stem cells

muscle cells

skin cells

liver cells

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

muscle cells

stem cells

prison cells

glial cells

100 years

1 month

1 year

10 years

all of the above

spinal cord

a nerve

brains