Biology Digestion Ia Essay

1385 Words Mar 27th, 2013 6 Pages
Biology Digestion IA
13/03/2013 Jason Gao
Digestion is the chemical breakdown of food into smaller components that are more easily absorbed. Digestion is a form of catabolism: a breakdown of large food molecules to smaller ones. When food enters into stomach, gastric juice starts protein digestion. Gastric juice mainly contains hydrochloric acid and pepsin. The pH value of hydrochloric in the stomach is 2, as the activity of pepsin is optimal, while it will lose its activity at pH 6.5 and above. However, pepsin will regain its activity at pH of 8. In the range of pH1 to pH6.5, pepsin will be most active at pH2, and starts to decrease its
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The solution turned into green from colourless.
Data analyse: The graph above shows the relationship between concentration of hydrochloride solution and change in gelate’s mass. It makes a fairly clear point on how different concentration of

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