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What gets digested?? Complete the table…. Macromolecule Monomers Starch/glycogen Fatty acids & glycerol Nucleic acids (DNA/RNA) Amino acids Cellulose.

Published byReginald Mosley Modified over 6 years ago

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Presentation on theme: "What gets digested?? Complete the table…. Macromolecule Monomers Starch/glycogen Fatty acids & glycerol Nucleic acids (DNA/RNA) Amino acids Cellulose."— Presentation transcript:

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3 What gets digested?? Complete the table…. Macromolecule Monomers
Starch/glycogen Fatty acids & glycerol Nucleic acids (DNA/RNA) Amino acids Cellulose Why?

4 Absorption in the small intestine
Identify the layers of tissue in the small intestine Describe how the small intestine is adapted for absorption Describe different mechanisms of absorption in the small intestine

5 Lumen Serosa

6 Let’s have a look..

7 Ingestion Digestion Absorption
The process of taking substances into cells and then the blood The rate of absorption depends on the surface area of the epithelium What is absorbed? Water Glucose Amino acids Nucleotides Glycerol Fatty acids Mineral ions Vitamins

8 Adaptations for absorption
How is the small intestine adapted for efficient absorption? - Villi/microvilli provide a large SA - Wall one cell thick = short diffusion pathway Network of capillaries to maintain concentration gradient Capillaries carry glucose/amino acids away - Lacteal carries fatty acids away Many mitochondria to produce ATP (for active transport)

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10 Methods of absorption into villi
PASSIVE (No ATP): Simple diffusion Facilitated diffusion ACITVE (ATP used): Active transport Endocytosis Increase surface

11 Passive Simple diffusion Down concentration gradient
Small molecules/non-polar molecules Fatty acids Increase surface

12 Passive Facilitated diffusion Down concentration gradient
Protein also used due to size/polarity Glucose and amino acids Increase surface

13 Active Active transport Uses membrane pumps
Move against concentration gradient Use ATP Glucose and amino acids (under certain circumstances. Such as??) Increase surface

14 Active Endo/Exocytosis
Molecules trapped in an infolding of the membrane Pass through to the other side as a vesicle Macromolecules that have not yet been fully digested Increase surface

15 How are specific molecules absorbed??
Separate statements into glucose and triglycerides. Order all glucose statements Order all triglyceride statements Annotate diagram (key on the back)

16 HW Summerise the digestion and absorption of starch Due..

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