1. Menu of the Day Describe the structure of the
villus in small intestines and its
role.
Describe the role of capillaries
and lacteals in absorption.

2. Experiment on Absorption of Digested Food
Class Activities
Station 1 (15 mins):
Experiment on Absorption of Digested Food
Station 2 (15 mins):
Tablet PC
& Case Study

3. possible signs and symptoms?
Case Study
Doc, I have recently gotten back my blood test. The results show that I have been diagnosed with coeliac disease.
Coeliac disease is a a digestive disease that damages the villi in the small intestines.
What are the
possible signs and symptoms?

4. Surface area to volume ratio for absorption will decrease.
Lack of nutrients will be taken into the body
Weight loss?
Easily tired?
Osteoporosis?
May suffer from deficiencies in iron, vitamins and other nutrients.

5. Adaptions of Villi in Small Intestines
Summary
Adaptions of Villi in Small Intestines
Villi provide efficient absorption surface by having:
(1) rich supply of blood capillaries
(transporting amino acids, simple sugars, vitamins, mineral salts) and lymphatic capillaries (fats & fat-soluble vitamins).

8. 2) thin membrane of
epithelium. ( 1 cell thick )
3) moist and large surface
area of villi bearing
numerous microvilli.
4) continual transport of
digested substances help
to maintain
diffusion gradient for
absorption.

9. Absorption of glucose and amino acids:
Nutrients are taken into the body cells by diffusing into the blood capillaries in villi and circulated via the bloodstream to other parts of the body.

10. Read up your textbook page 105 – 108 on the function of liver.
Homework
Read up your textbook page 105 – 108 on the function of liver.

12. Small Intestines  Hepatic Portal Vein  Liver
Assimilation:
Transport and utilization of nutrients.
Nutrients are transported to liver through hepatic portal vein for processing, storage and distribution to other body parts.
Small Intestines  Hepatic Portal Vein  Liver

13. Liver functions in Digestion & Assimilation
Production of bile.
Food Storage:
(i) Regulate blood glucose concentration:
Glucose (after meal): Store glycogen with the help of hormone insulin released from pancreas.
Glucose (starving): Convert glycogen back to glucose.
(ii) Vitamins(A, B, D), minerals copper and potassium, as well as iron to make red blood cells.

14. Heat Production by liver is carried around body to keep warm.
Chemical Factory:
Detoxification of harmful substances (alcohol, medications, micro-organisms, fats) absorbed into blood stream from gut.
Synthesis of proteins ( e.g fibrinogen for clotting blood, albumins)
Deamination of excess amino acids form to be excreted as urea.

15. Which of these diagrams represent a healthy liver?
What are the consequences of a fatty liver?
Ans: Liver is not able to filter and cleanse the blood stream efficiently and the blood stream will become overloaded with toxins and fat.

16. What happened to the excess amino acids in our body?
Excess A.A
Deamination by liver
Ammonia
Carbohydrate
+ CO2
stored as
Urea
Glycogen
EXCRETION
Ans:________________________________