Biology News
Department of Chemistry and Biochemistry Invests in System to Recycle a Precious Resource, Helium - University of Arkansas Newswire


University of Arkansas Newswire
The Department of Chemistry and Biochemistry in the J. William Fulbright College of Arts and Sciences recently installed a liquid helium recovery system. Wesley Stites, the department's chair, said the investment for the system cost about $250,000, but ...

New system can identify drugs to target 'undruggable' enzymes critical in many diseases - Science Daily


Science Daily
Scientists from the Medical Research Council (MRC) Laboratory of Molecular Biology, in Cambridge, UK, demonstrated the capabilities of the new system by identifying a molecule that could successfully target a phosphatase to reduce the accumulation of ...

Medical school renames Department of Anatomy and Regenerative Biology - GW Hatchet


GW Hatchet
The School of Medicine and Health Sciences renamed the Department of Anatomy and Regenerative Biology to the Department of Anatomy and Cell Biology, according to a release from the school Tuesday. Sally Moody, the chair of the department, said the ...

Introductory Anatomy: Respiratory System

Leeds - United Kingdom

The word respiration describes two processes.
Internal or cellular respiration is the process by which glucose or other small molecules are oxidised to produce energy: this requires oxygen and generates carbon dioxide.
External respiration (breathing) involves simply the stage of taking oxygen from the air and returning carbon dioxide to it.

The respiratory tract, where external respiration occurs, starts at the nose and mouth. (Description of respiratory tract from nose to trachea here from overheads) (There is a brief complication where the airstream crosses the path taken by food and drink in the pharynx: air flows on down the trachea where food normally passes down the oesophagus to the stomach. )

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We often complete the daily tasks of living without thinking about the respiratory system. We breathe in and out and take for granted one of our most vital organ systems. The respiratory system provides the oxygen necessary to sustain life. It consists of both upper and lower respiratory tracts. It is divided into two functions: conducting and respiration.

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Eleven respiratory simulations are available for download as freeware, including mechanics models, general gas exchange models, Va/Q relationships models, and acid-base balance models.

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This system includes the lungs, pathways connecting them to the outside environment, and structures in the chest involved with moving air in and out of the lungs. Air enters the body through the nose, is warmed, filtered, and passed through the nasal cavity. Air passes the pharynx (which has the epiglottis that prevents food from entering the trachea). The upper part of the trachea contains the larynx. The vocal cords are two bands of tissue t