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Unformatted text preview: “blood,” such as “I have Irish blood,” gives people the impression that blood plays
a role in heredity. This was an old belief, from before the discovery of the principles of genetics, when
people believed that traits were inherited by some kind of blending of fluids from both parents. Genetics has Notes Biology 103
Dr. Karen Bledsoe
http://www.wou.edu/~bledsoek/ shown that this is not so. Traits are inherited when sperm and egg, which carry chromosomes with genes for
• Students often believe that blood travels in one continuous loop around the body. In fact, blood vessels
create multiple loops to serve different parts of the body. That is, one drop of blood does not circulate
completely around the body before returning to the heart. An artery will take it to one part of the body, a vein
will bring it back.
• Many students do not relate the role of the heart and the lungs in blood circulation, and forget that blood
must go through the lungs to be oxygenated.
• Students often believe that high blood pressure, heart disease, high cholesterol, and similar disorders of the
circulatory system are “old people’s” diseases. However, genetics plays a role in...
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This document was uploaded on 02/25/2014 for the course BIOLOGY 103 at Western Oregon University.
- Winter '09