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Unformatted text preview: Olesia Stockhold Biology 105-Fall 2009 LAB 15: Homeostasis Objective: To observe and understand how the human body reacts to certain changes in its external environment in order to maintain Homeostasis, and to clearly identify what these reactions are. Hypo t h e s i s: Homeostasis is the biological process by which an organism maintains its internal functions when faced with an internal metabolic or external environmental change. The lab will reveal reactions from reflexes by way of this process because an external change in environment will occur, causing homeostasis in the human body. I predict that my pupils will dilate to a larger size when during external assault (i.e. throwing the paper balls at my reflection). My tear ducts will start to well up when the onion is cut in front of me, and when I open my eyes to the light, the pupils will dilate. The reactions I will have will be blinking, flinching, loss of balance, and increased heart rate. Proce d u r e: a) Materials Used: Assistant; Wall Mirror; Paper; Onion; Knife; Bright Light; First, I read the review discussing homeostasis in the lab manual (pg.116). Next I found a mirror on the wall in my bathroom where the light is bright, and the mirror is in a position where it can be easily observed. in a position where it can be easily observed....
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