The Respiratory System plays a huge role in the functioning of our body. This system supplys oxygen to our blood, sending it throughout our entire body. All of our cells require oxygen to be able to move, build, reproduce, and convert food ino energy. Without the Respiratory System, our body would completely shut down. Brittany, Brii, and I are going to show you exactly how this system functions.

The Respiratory System:
  • The nose consists of the visible external nose and the internal nasal cavity. The nasal septum divides the nasal cavity into right and left sides. Hair, mucus, blood capillaries, and cilia that line the nasal cavity filter, moisten, warm, and eliminate debris from the passing air.

  • The pharynx (throat) consists of the following three regions, listed in order through which incoming air passes.

  • The nasopharynx receives the incoming air from the two internal nares.

  • The oropharyrnx receives air from the nasopharynx .

  • The laryngopharynx passes food to the esophagus and air to the larynx.

  • The larynx receives air from the laryngopharynx.

  • The epiglottis, the first piece of cartilage of the larynx, is a flexible flap that covers the glottis, the upper region of the larynx, during swallowing to prevent the entrance of food.
  • The paired arytenoids cartilages in the rear are horizontally attached to the thyroid cartilage in the front by folds of mucous membranes. The upper vestibular folds (false vocal cords) contain muscle fibers that bring the folds together and allow the breath to be held during periods of muscular pressure on the thoracic cavity. The lower vocal folds (true vocal cords) contain elastic ligaments that vibrate when skeletal muscles move them into the path of outgoing air.

  • The trachea (windpipe) is a flexible tube, 10 to 12 cm (4 inches) long and 2.5 cm (1 inch) in diameter.

  • The primary bronchi are two tubes that branch from the trachea to the left and right lungs
  • Inside the lungs, each primary bronchus divides repeatedly into branches of smaller diameters, forming secondary (lobar) bronchi, tertiary (segmental) bronchi, and numerous orders of bronchioles, including terminal bronchioles and microscopic respiratory bronchioles.

  • Alveolar ducts are the final branches of the bronchial tree. Each alveolar duct has enlarged, bubblelike swellings along its length. Each swelling is called an alveolus, and a cluster of adjoining alveolar is called an alveolar sac. Some adjacent alveoli are connected by alveolar pores.

  • The respiratory membrane consists of the alveolar and capillary walls. Gas exchange occurs across this membrane.


Exchange of Carbon Dioxide and Oxygen:

The primary function of the respiratory system is to exchange oxygen and carbon dioxide. Inhaled oxygen enters the lungs and reaches the alveoli. The layers of cells lining the alveoli and the surrounding capillaries are each only one cell thick and are in very close contact with each other. Oxygen passes quickly through this air-blood barrier into the blood in the capillaries. Similarly, carbon dioxide passes from the blood into the alveoli and is then exhaled. Oxygenated blood travels from the lungs through the pulmonary veins and into the left side of the heart, which pumps the blood to the rest of the body Oxygen-deficient, carbon dioxide-rich blood returns to the right side of the heart through two large veins, the superior vena cava and the inferior vena cava. Then the blood is pumped through the pulmonary artery to the lungs, where it picks up oxygen and releases carbon dioxide

Conclusion: The Respiratory System is very important in how the body functions. Without it none of the other body systems would be able to work. The respiratory system is what keeps us alive, it gives Oxygen to blood wich replinishes the other organs and cells.

References: of the Respiratory System.18 Sep 2009

Butt, J. "Respiratory System." Medindia - Medical/Health Website. 18 Sept. 2009. 18 Sept. 2009

Fun Facts:
  • Your lungs contain almost 1500 miles of airways and over 300 million alveoli.
  • Every minute you breathe in 13 pints of air.
  • More than half a liter of water per day is lost through breathing.
  • People under 30 years of age take in double the amount of oxygen in comparison to a 80 year old.
Q and A:
Q: How does the Respiratory system interact with the Circulatory system? asthma.jpg
A:The respiratory and circulatory systems work together as a unit to exchange gasesbetween body cells and the environment.
Q: What is the most common respiratory disease?
A:The most common respiratory disease is Asthma. About 300 million people around the world had asthma
in 2007. Asthma is a chronic disease that makes your airways sore and swollen.
Q: Why do we need to breathe?

A:All of the cells in our body require oxygen. Without it, they couldn't move , build reproduce, or turn food into energy. So without oxygen they and we would die.

CO2 and O2