National Geographic: The Incredible Human Body

00:06:53 is a single cell - no wider than a hair

00:09:38 strands of information that will soon unite.

00:11:38 in a very powerful force.

00:13:56 Narrator: Embryonic stem cells stand in the vanguard of human life.

00:16:06 one of the first and basic questions

00:18:23 Whether or not she'll get pregnant

00:20:22 it consumes 20 percent of the oxygen his body uses.

00:22:17 So if I want to get the skull off

00:24:04 I think it's a very difficult decision.

00:25:58 and the fetus hopefully later to baby

00:27:42 through the umbilical cord back to it's mother

00:29:41 messages are sent to speed up the heart rate accordingly.

00:32:16 creates much quicker reaction time on the court.

00:34:27 Scott is less than a day away from surgery.

00:36:20 has puzzled scientists for centuries.

00:38:16 So there's a lot of retention -

00:39:47 Anything we didn't note, please go out and look for it.

00:41:38 a little bit of software.

00:43:19 Now we dream. Can these insights be used

00:45:38 Narrator: Scott must remain absolutely still for the surgery

00:47:27 of his arm, his hand, his fingers and thumb, all in here.

00:49:08 Your speech is just fine, obviously. Your arm's okay

00:51:30 I walked around the corner slow

00:53:43 Narrator: for Inez and Darryl