The respiratory system takes in oxygen and releases carbon dioxide. The trachea branches into the bronchi, which carry air into the lungs. Muscles in the ureters continuously contract and relax to move urine from the kidneys to the bladder. The bladder stores urine until it is full, at which point the person empties it. The digestive system breaks down food into nutrients that can enter the bloodstream. Food moves from the stomach to the small intestine, where nutrients are absorbed and waste is eliminated. The heart is a muscular pump located in the chest cavity. It has four chambers and pumps blood through two main circuits to circulate oxygen and nutrients to the entire body.

1. BODY SYSTEM By Tessa

2. BLOOD
The lungs are the main organs of the respiratory system. In the lungs oxygen is taken
into the body and carbon dioxide is breathed out. The trachea is sometimes called
the windpipe the trachea filters the air we breathe and branches into the bronchi.
The bronchi are two air tubes that branch off of the trachea and carry air directly
into the lungs.

3. PEE
Muscles in the ureter walls continuously tighten and relax to force urine away from the
kidneys. A backup of urine can cause a kidney infection. Small amounts of urine are
emptied into the bladder from the ureters about every 10 to 15 seconds. The
bladder is a hollow muscular organ shaped like a balloon. It sits in the pelvis and is
held in place by ligaments attached to other organs and the pelvic bones. The
bladder stores urine until you are ready to empty it.

4. FOOD
The digestive system is made up of organs that break down food into protein,
vitamins, minerals, carbohydrates, and fats, which the body needs for energy,
growth, and repair. After food is chewed and swallowed, it goes down the
oesophagus and enters the stomach, where it is further broken down by
powerful stomach acids. From the stomach the food travels into the small
intestine. This is where your food is broken down into nutrients that can enter
the bloodstream through tiny hair-like projections. The excess food that the
body doesn't need or can't digest is turned into waste and is eliminated from
the body.

5. BLOOD PUMPING
The heart is a muscular pumping organ located medial to the lungs along the body’s
midline in the thoracic region. The bottom tip of the heart, known as its apex, is
turned to the left, so that about 2/3 of the heart is located on the body’s left side
with the other 1/3 on right. The top of the heart, known as the heart’s base, connects
to the great blood vessels of the body: the aorta, vena cava, pulmonary trunk, and
pulmonary veins.

6. RESOSES
http://www.fi.edu/learn/heart/systems/circulation.html
http://bluestonesurgical.com/small_intestine
http://kidney.niddk.nih.gov/kudiseases/pubs/uichildren/
http://www.youngmenshealthsite.org/urinary_tract_infection.html
http://kidshealth.org/kid/htbw/pee.html
http://kidney.niddk.nih.gov/kudiseases/pubs/yoururinary/
http://en.wikipedia.org/wiki/Urinary_system