Photosynthesis Lab Report

Introduction The lung is a spongy organ made up of of irregularly shaped air spaces called Alveoli. The alveoli are lined by a single layer of flat cells and supported by a mesh of fine elastic fibers. The alveoli are surrounded by a rich network of pulmonary capillaries (Couch and Berger, 2004). Our lungs are a network of connected tubes that bring oxygen from the air into our blood, nourishing the trillions of cells that make up our bodies. The lungs also clean the blood of carbon dioxide waste created when cells use oxygen (Natural Geographic, 2012). In experiment one I hypothesize that the effect of respiration changes on carbon dioxide, concentration in exhaled air will be greatest the longer the respiration rate is increased. I predict that during normal breathing the time it takes to detect the carbon dioxide will be greatest.
The normal breathing test tube took the longest then after hyperventilation, and then after exercise had the biggest CO2 concentration because of how quickly it was detected. See Table 1. In the second experiment, the original pH of the alkaline phenol red was 4.0. After adding CO2 by exhaling, the color changed from a deep red to a bright red. The pH of the solution also changed; it changed to a 6.0 so it became more neutral by adding CO2 which is more basic then the alkaline phenol red. See Table 2.
My prediction that there would be a color change went hand in hand with my hypothesis because I knew if there was to be a change then normally a color change would also occur. There was no potential for error, everything was straight forward and the measurements were exact. I checked my results and found everyone else who did this experiment got the same results so my data is