Friday, 16 January 2015

Respiratory System


Breathing has two mechanisms,

The inspiration which supplies oxygen to the body and the expiry eliminating the CO2 
The term breathing also another direction where it meets the chemical oxidative reactions within the cells of the body; corresponding to oxygen consumption at the cellular level to degrade glucose or lipids and producing CO2;

The gas exchange in the alveoli is diffusion through a mechanism called the pulmonary ventilation matching. All respiratory movements ensuring the renewal of the air passing through the lungs. These movements are due to respiratory interring costal muscles and diaphragm (the muscle end to the base of the lungs that separates the chest from the abdomen).

Breathing is an automatic, unconscious phenomenon. At rest, the rate or respiratory rate of an average adult is 16 breaths per minute.

Every day an adult inspires 8000 liters of air (0.5 liters of air per breath about).
During inspiration, air enters the lungs via the nasal cavity and the trachea and the oxygen (O2) contained in the air passes through the wall of the alveoli. Its then binds directly into the blood capillaries on red blood cells (RBCs) and dissolved in blood plasma passes it in the opposite direction from the blood into the pulmonary air to be expelled by expiration.

Then the oxygenated blood is transported throughout the body (cells and organs) through the arteries by blood flow. In cells cellular respiration occurs when O2 is consumed and the CO2 produced by a redox reaction that releases energy in the form of a molecule called ATP. The CO2 produced is dissolved in blood plasma and is redirected to the lungs through the venous blood flow to be expelled into the pulmonary air by the expiration mechanism.