Respiratory system
The Human Respiratory System is a series of organs which facilitates the diffusion of oxygen into the bloodstream and distributes throughout the body and receives carbon dioxide from the blood and removes the process of exhalation. The primary organs of the respiratory system are lungs, which carry out this exchange of gases as we breathe.
The respiratory system consists of the upper and lower respiratory tracts. The upper respiratory tract composes of Nasal cavity, Pharynx, and Larynx. The lower Respiratory Tract composes of Lungs, Diaphragm, Trachea, Bronchi and Bronchioles.
Gaseous Exchange:
The main function of the respiratory system is a gaseous exchange. This refers to the process of Oxygen and Carbon Dioxide moving between the lungs and blood. Diffusion occurs when molecules move from an area of high concentration (of that molecule) to an area of low concentration. This occurs during the gaseous exchange as the blood in the capillaries surrounding the alveoli has a lower oxygen concentration of Oxygen than the air in the alveoli which has just been inhaled.