domingo, 22 de octubre de 2017

6º Unit 2 Nutrition

6º. Unit 2.Nutrition
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The digestive system is responsible for breaking down FOOD we eat into smaller components so that NUTRIENTS can be easily absorbed by the body and the waste discarded.
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 With each heartbeat, blood is sent throughout our bodies, carrying oxygen and nutrients to every cell. Every day, the approximately 10 pints (5 liters) of blood in your body travel many times through about 60,000 miles (96,560 kilometers) of blood vessels that branch and cross, linking the cells of our organs and body parts.

The circulatory system is composed of the heart and blood vessels, including arteries, veins, and capillaries. Our bodies actually have two circulatory systems: The pulmonary circulation is a short loop from the heart to the lungs and back again, and the systemic circulation (the system we usually think of as our circulatory system) sends blood from the heart to all the other parts of our bodies and back again.


 The job of your respiratory system is very simple: To bring oxygen into your body by the lungs, and remove the carbon dioxide from your body. Your body needs oxygen to survive.
 Oxygen is used by your cells as it performs the functions of life. As your body uses oxygen, your cells produce another gas known as carbon dioxide. Too much carbon dioxide can be toxic, even deadly. For this reason, it is important that your body have a way to get rid of it.



The Excretory system is responsible for the elimination of wastes produced by homeostasis.
 There are several parts of the body that are involved in this process, such as sweat glands, the liver, the lungs and the kidney system.
Parts of the Urinary Tract

  • kidneys: two bean-shaped organs that filter waste from the blood and produce urine
  • ureters: two thin tubes that take pee from the kidney to the bladder
  • bladder: a sac that holds pee until it's time to go to the bathroom
  • urethra: the tube that carries urine from the bladder out of the body when you pee
The excretory system is very important to your body and only has a few parts. In a similar way to removing solid waste from your body, you must also get rid of fluids. You know the results of the excretory system as urine.  
 Urine is the result of the excretory system balancing the amount of water and salts in your body. We said the system is small. Your kidneys are the core organs involved in the excretory system. Related body parts include the ureters, bladder, and urethra. Once the urine passes through your urethra, that's it, it's out of your body.