traduccion video de human body

UNIT 4 VIDEO JOURNAL “THE HUMAN BODY”
The human body. No machine can match the feats it performs every day. Our lungs suck in 70 quarts of air each minute when we exercise… our hearts pump twothousand gallons of blood each day… and more than 600 muscles keep us moving, in every direction.

Like all living things, human beings are made up of cells- 100 trillion of them. Individual cell areorganized into tissues… like this heart muscle tissue. Different kinds of tissue form an organ, such as the heart. And several organs working together create an organ system. Each of the 10 major organsystem in the human machine performs a special job.

The circulatory and respiratory system supply energy 24 hours a day. The heart works automatically, and incredible hard. No other muscle in thebody is a strong. It beats 100.000 times a day… 36 million times a year, sending blood on a complete trip around the body in less a minute. The lungs pull in oxygen from air, delivering breath through15 hundred miles of airways.

All this work is fueled by food… and turning pizza into useable molecules is the job of the digestive system. Swallowing send food down the esophagus into the stomach.Like a blender, the stomach contracts to break it down, helped out by acid and enzymes. This liquefied food travels into the small intestine, which can be over 20 feet long, where most nutrients enterthe bloodstream.

And the brains of this whole operation- is the human brain. A wrinkled blob about the size of a grapefruit, it is the most complex object on earth. The brain contains up to 100billion neurons, or nerve cells. Neurons send signals rocketing through the brain at over 200 miles an hour. The brain, spinal cord and nerves make up the nervous system- and all work together tocontrol the body’s activities.
The reproductive system creates new life. Each human begins two single cells- an egg cell from the mother, and a sperm cell from the father. When these two cells meet, they...