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so sleep alone tonight
My name is ღ||汇嘉||SOPHIAღ. Give me presents! On 22061996 :D [Cancer] [CHRISTIAN] PLMGSS 2.1 I love Aaron (: |
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about this blog
This blog was opened by (SOPHIAARON) to accomodate (SOPHIA)'s Science journal.Do enjoy your stay here, and don't take what's not yours! tagboard
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Biology 10
Next up.....DUODENUM (:  This is the first part of the Small Intestine and it digests ALL classes of food, hence making it the most hardworking organ in the entire digestive system. Nonetheless, all organs have to work together to form a healthy and working system (: In the duodenum, partially digested food will be passed on from the stomach. As I mentioned earlier, all classes of food will be digested: Fats, Carbohydrate and Protein. The enzymes present in the duodenum is produced by the pancreas by the the pancreatic duct. The pancreatic juice contains these enzymes: Trypsin, Pancreatic amylase, lipase and maltase. Bile salt is excreted by the liver to emulsify fats into fatty droplets for lipase to act on. Let's analyse each enzyme. 1) Pancreatic amylase : We might ask, why do we still need maltose in the duodenum since we have the salivary amylase in our mouths? Yes indeed, we do have salivary amylase in our mouths. However, do we all chew our food properly? The answer is definitely no! Not all starch present in the food is able to be digested by our salivary amylase as food is often swallowed before being chewed and digested. Therefore, the pancreatic amylase is definitely required to digest the starch that was yet to be digested. 2) Maltase: After starch is broken down into maltose by the pancreatic amylase, maltase acts on the maltose to digest it to become simple sugar. i.e. glucose, sucrose or fructose. This enzyme is only present in the S.I. 3) Trypsin: Why is trypsin required when protein is already digested in the stomach? The reason is, sometimes, proteins are not broken down directly into amino acids. There are sometimes broken down into peptides by the pepsin in the stomach. Hence, trypsin is needed to digest the peptides/proteins completely into amino acids for absorption. This enzyme can only survive in alkaline conditions of pH9. Therefore, the trypsin that we eat in our food will be denatured and when it passes the stomach, it is too acidic for it to withstand. 4) Lipase: Lipase are enzymes which act on fats. However, before it digests fats into fatty acids and glycerol, it is first being broken down by the bile salt which is produced by the liver into fatty droplets. This process of emulsification increase the fat digestion rate (: |