BIOL140 Lecture 2: Bio 140- Lectures Two and Three
21 Jun 2016
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Habitable regions- all areas on earth where organisms can survive. Molecules are needed to build cells, structures, and whole organisms. Molecules are used for growth, repair and functions. Molecules are consumed, broken down and rebuilt into needed structures. Reproduction- making more of the same species a. Cell grows from half size to full size. Bacteria colony growth by adding more individuals b. Homeostasis- maintaining a set of conditions for survival. External environment is usually different from internal environment. Air temp= 10 c body temp= 37 c. Pressure from external environment constantly effects the internal environment. Returns the body to the state it needs to be in. Eat a meal glucose in blood increases beyond normal limits sensors activate brain is signalled homeostasis response (increases insulin in blood) glucose enters cells glucose levels fall to normal limits . Sensors activate brain is signalled mechanism is stopped. Increase in insulin in blood because of increase in glucose levels.
