Small intestine (Duodenum)

Prepare your whiteboards! Let’s Recap!

Name the three parts of the small intestine

Let’s Recap! Name the three parts of the small intestine 1)Duodenum 2)Jejunum 3)Ileum

Let’s Recap! Name the three secretions found in the duodenum

Let’s Recap! Name the three secretions found in the duodenum 1)Intestinal Juice 2)Pancreatic Juice 3)Bile

Lesson Objectives To state the 3 secretions found in the small intestine and describe the enzymatic reaction that takes place in the duodenum. To understand some of the answering techniques in Science (Biology) questions: – Graphing techniques in science – Task words

Let’s Recall The 3 secretions: – Intestinal Juice – Pancreatic Juice – Bile (no enzymes)

Small intestine Region of digestion SecretionSourceEnzymeAction Small intestine Bile Pancreatic juice Intestinal juice

Small intestine Region of digestion SecretionSourceEnzymeAction Small intestine BileLiver-Emulsifies fat Pancreatic juice PancreasAmylase Protease (Trypsin) Lipase Starch  maltose Proteins  polypeptides Fats  fatty acids and glycerol Intestinal juice Intestinal glands Maltase Protease (Erepsin) Lipase Maltose  glucose Polypeptides  amino acids Fats  fatty acids and glycerol

Small intestine SubstrateEnzyme Product/ Substrate EnzymeProduct Starch Pancreatic amylase MaltoseMaltaseGlucose Carbohydrate digestion

Small intestine Protein digestion – Some digested in the stomach – Undigested proteins enter small intestine – Converted to polypeptides by protease (trypsin) SubstrateEnzyme Product/ Substrate EnzymeProduct Proteins Protease (Trypsin) Polypeptides Protease (Erepsin) Amino acids

Small intestine Fat digestion – Bile emulsifies fats and breaks them up into minute fat globules Enlarges surface area of fats Speed up digestion – End products are fatty acids and glycerol SubstrateEnzymeProduct FatsLipase Fatty acids and Glycerol

Diagram for fat emulsification big drop of fat bile salts tiny fat droplets +

Answering techniques Graphing in Science

Graph

Give an appropriate title to the graph. Example : Graph of rate of reaction against temperature

Graph Check that you have gotten the x- and y-axis correct. E.g. Plot a graph of rate of bubbling against light intensity: the rate of bubbling takes the y-axis and the light intensity takes the x-axis.

Graph Label the axes clearly and include units for each axis if applicable.

Graph Use appropriate scale for both axes. It is alright not to start at zero for both axes if you wish to stretch the curve in order to maximize the space on the graph paper. (3/4 of the space provided)

Graph Draw a best-fit curve. Use a flexible curve / free hand for drawing a curve and a ruler for drawing a straight line. Try your best to pass the curve / straight line through as many points as possible. (Note: The term ‘curve’ used in plotting of graph in biology can mean an actual curve or a straight line.)

Graph Do not extrapolate the curve beyond the first and last point.

Words that tell you what you need to do

List of task words Define State List Describe Explain / Account Outline Suggest Illustrate Name / Identify Discuss Distinguish

Muddiest Point