Respiratory/Digestive System

By Abhishek Hatle

The Importance of the Respiratory System

The importance of the respiratory system is understood by the role the system plays in the function of other systems in the body, such as the circulatory system. After oxygen enters the blood, it travels through the body and is picked up by red blood cells. The oxygen is carried by the red blood cells to the heart. From the heart, the oxygen-enriched red blood cells are pumped into tissues and arteries throughout the whole body.


The nose is the primary upper respiratory organ in which air enters into and exits from the body. Nasal cavity there are frontal, nasal, ethmoid, maxillary, and sphenoid bones.The pharynx is a tubular structure that allows air to pass from the mouth to the lungs. The pharynx contains three parts: The nasopharynx, which connects the upper part of the throat with the nasal cavity; the oropharynx, positioned between the top of the epiglottis; and the laryngopharynx, located below the epiglottis. From the pharynx, air enters into the larynx.The larynx is a passage way for air to enter the lungs.The bronchi allow the passage of air to the lungs.The lungs are spongy, air-filled organs located on both sides of the chest cavity.Alveoli which are tiny grape-like sacs at the end of the respiratory tree exchange of oxygen and carbon dioxide gases.The diaphragm is a muscular structure located between the thoracic and abdominal cavity.


The mouth is the beginning of the digestive tract. Digestion starts here when taking the first bite of food, chewing breaks the food into pieces that are more easily digested. Located in your throat near your trachea, the esophagus receives food from your mouth when you swallow.The stomach is a hollow organ that holds food while it is being mixed with enzymes that continue the process of breaking down food. The small intestine is a 22-foot long muscular tube that breaks down food using enzymes released by the pancreas. The pancreas secretes digestive enzymes into the duodenum, the first segment of the small intestine. These enzymes break down protein, fats, and carbohydrates.The liver's main function within the digestive system is to process the nutrients absorbed from the small intestine.The gallbladder stores and concentrates bile.The colon is a 6-foot long muscular tube that connects the small intestine to the rectum.The rectum is an 8-inch chamber that connects the colon to the anus. It is the rectum's job to receive stool from the colon, to let the person know that there is stool to be evacuated.The anus is the last part of the digestive tract. It is a 2-inch long canal.


Respiratory System

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Digestive System

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