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The Respiratory System

The respiratory system for gaseous interchange, which consists of the upper respiratory tract and the lower respiratory tract. The upper and lower tracts consist of the mouth, nose, pharynx, and larynx and then in the lower trachea, bronchi, bronchioles, and alveoli. Respiration is carried on by the expansion and contraction of the lungs; the process and the rate at which it proceeds are controlled by a nervous center in the brain. We cover the respiratory system with these articles.

by Dr. Gary Farr — Last Updated on 7/22/2003

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by Dr. Gary Farr — Last Updated on 7/22/2003

The health survey finds out about the state of your health. You may discover things about your health you didn't know before. This increased awareness of your health can help you take the appropriate action to improve the state of your body's function.

by Dr. Gary Farr — Last Updated on 8/4/2003

Our lungs bring fresh oxygen into our bodies and remove carbon dioxide and other gaseous waste products. As we breathe air in, we use the muscles of our rib cage and especially the major muscle called the diaphragm (pronounced DY uh fram), to pull air into our lungs.

by Dr. Gary Farr — Last Updated on 8/4/2003

The lungs are the main organs of our respiratory system. The right lung is composed of 3 lobes and weighs a little over a pound. The left lung weighs a little under a pound and consists of 2 lobes. The trachea enters the lungs and branches out into bronchi, and then bronchioles (about .01 inches in diameter), and eventually into 250 million air sacs called alveoli. We cover our breathing apparatus in detail.

by Dr. Gary Farr — Last Updated on 8/5/2003

The respiratory system consists of organs that deliver oxygen to the circulatory system for transport to all body cells. Oxygen is essential for cells, which use this vital substance to liberate the energy needed for cellular activities.