All animals require oxygen. Oxygen enables living things to metabolize (or burn) nutrients, which releases the energy they need to grow, reproduce, and maintain life processes. Some animals can exist for months on fats or other foods stored in their...

The respiratory system is a series of organs designed to facilitate the exchange of gases, primarily oxygen and carbon dioxide, between red blood cells in the circulatory system and the outside environment. Human cellular physiology requires a constant...

It is amazing to think that almost all life forms require some type of respiratory system which allows them to take in oxygen and give off carbon dioxide. Going back through evolution, one can see an enormous variety of apparatuses which allow...

The human respiratory system, working in conjunction with the cardiovascular system, supplies oxygen to, and removes carbon dioxide from, the cells of the body. The respiratory system conducts air to the respiratory surfaces of the lungs. There, the...

Among quadrupeds, the respiratory system generally includes tubes, such as the bronchi, used to carry air to the lungs, where gas exchange takes place. A diaphragm pulls air in and pushes it out. Respiratory systems of various types are found in a wide...

Philadelphia Tribune, The 02-09-1999 Understanding your respiratory system By Glenn Ellis, Sr. Asthma. Allergies. Sinusitis. Bronchitis. Emphysema. Pneumonia. Sore Throat. What do these disorders all have in common? They are the result of the health of the respiratory system. Over...

THE MOVEMENT OF GASES INTO AND OUT OF the lungs is the key to life. A simple and complex process, respiration involves both conscious and automatic efforts. The brain sends impulses down the phrenic nerve to the diaphragm, causing it to contract, which...

Ma Lik, the head of Hong Kong's leading pro-Beijing political party who questioned whether China's Tiananmen Square crackdown in 1989 should be called a massacre, died Wednesday, an official said. He was 55.Ma underwent surgery for colon cancer in 2004, but the party's Vice Chairman...

Biologists caught a 7-foot-long shark that had become a tourist attraction by making daily incursions into knee-high water on a Spanish beach, wrestling it with their bare hands and dragging it ashore.But the rescue effort may have been for naught because the shark was very...

The health of the human respiratory system is critical to our overall health. This discussion explores the features of the lungs and respiratory tract, the breathing process, and diseases of the respiratory system, including tuberculosis and emphysema.