Systems Of Our Body-DigestiveExcretory&Respiratoyr

By sabbirharun189 | Updated: Oct. 6, 2020, 5:03 p.m.

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Hello Everyone!
Today's topic: systems of our body
Today, I will share about 3 systems of our body and their functions. They are: digestive, excretory and respiratory system. I hope it is helpful.
Digestive system
At first we eat food and munch it through our mouth, while we munch the saliva from the salivary glands help us to make the food into a pasty and guey texture. Then the food goes through our esophagus to our stomach, where the stomach secretes acid and enzymes the food to digest. Then it goes to our small intestine where nutrients mostly get absorbed and goes to our blood stream. The job of the large intestine is to absorb the remaining nutrients from the food, also it changes the leftover pieces of the food we munched into food waste and the food waste comes out of the rectum.

excretory system:
How do the organs work? Kidney = kidneys are two bean-shaped organs located on either side of the backbone and are protected by the ribs and muscles of the back. Each adult kidney has a length of 10-12 cm, a width of 5-7 cm and weighs around 120-170g. Each kidney is attached to a ureter, a tube which carries excreted urine to the bladder. Urinary bladder = It is a muscular sac-like structure, which stores urine. The urinary bladder is emptied by the process of micturition. Ureter = A pair of thin muscular tubes called the ureter comes out of each kidney extending from the renal pelvis. It carries urine from the kidney to the urinary bladder. Urethra = This tube arises from the urinary bladder and helps to expel urine out of the body. Its opening is guarded by sphincter muscles.

How does it work? At first we drink water or have other food and that goes through the esophagus and to the stomach, where the stomach produces body fluid and blood. Then the blood goes to our heart. From the heart the blood goes to the kidney through the artery, to purify the blood and remove waste liquids from the blood as urine. Beside the artery there’s another vein named vena cava which sends purified blood to the heart .Each kidney has 1 million nephrons which helps the kidney purify the vital fluid. The heart sends the blood to our entire body then this process continues. When waste liquid comes out, it travels through the ureter and goes to the bladder. After it goes to the bladder we go to the washroom and remove the waste liquid from the bladder through the urethra. Before we remove the excess liquid, the sphincter helps us stop the flow of the liquid so we can wait instead of doing it anywhere. 
respiratory system:
The respiratory system starts with the nose. As we breathe oxygen, our lungs get pumped and when we breathe out it deflates like a balloon. We have nose hair which stops dust particles from getting to our lungs. The trachea is the way through which oxygen goes to our lungs. We have bronchioles which dilated the airway on our lungs and it also aids the proper amount of getting oxygen to the blood. The alveoli is where the lungs and blood exchange oxygen and carbon dioxide during the process of breathing in and out. The diaphragm is the muscle that supports and holds the lungs in place. It is the strongest and biggest muscle of all on the respiratory system.

Systems Of Our Body-DigestiveExcretory&Respiratoyr

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