Respiratory Disorders: Asthma, Bronchitis, Emphysema, Cystic Fibrosis

Asthma – results in contraction of smooth muscle that surrounds airways – makes breathing difficult – allergic reaction – treat with bronchodilators – causes airways to dilate (increase in diameter) Bronchitis – inflammation of bronchial lining + overproduction of mucous and frequent coughing – related to smoking and other irritants (air pollution etc) – increased…

What is Evolution?

Evolution describes the changes in the gene pool of a species over time.  These changes are the results of mutations, natural selection and genetic drift. Often populations produce more offspring than the environment can support; in other words, they often exceed the carrying capacity.  Over-production of offspring leads to intraspecific competition and survival of the…

Isomers: Structure and Function

In chemistry, isomers are compounds with the same molecular formula but different structural formulas. The word is derived from the Greek ισομερης, isomerès; isos = “equal”, méros = “part”. There are many different classes of isomers, like stereoisomers, enantiomers, geometrical isomers (see chart below). Isomers do not necessarily share similar properties, unless they also have…

What is Existentialism?

Existentialists believe that man’s own individual experience or “existing” comes before anything such as a general purpose, goodness or “truth,” or any other Absolute that may be felt to exist.  Man creates himself through his own thoughts and actions, since the only reality for an individual is that of his own personal existence and nothing…