1. Explain the difference between mechanical and chemical digestion.
2. Complete the following table:

   Enzyme group	Function
   Amylase
   Protease
   Lipase

3. Complete the following table .

   Food substance	Product of digestive system.	Enzyme	Organ where digestion begins	Organ where digestion is completed.
   Glucose
   Starch
   Protein
   Fats & Oils

4. Refer to a diagram in your booklet and practice labelling the parts of the digestive system.
5. Explain the function of the teeth, salivary glands and the tongue in the mouth.
6. What is meant by peristalsis? Explain how we can eat or drink standing on our head.
7. Complete the following table:

   Digestive Juice	Organ	Composition	Function
   Saliva
   Gastric juice
   Pancreatic Juice
   Intestinal Juice
   Bile

8. What is the first type of food compound to be acted upon by the digestive system? What is the last type of food to be broken down by the digestive system?
9. What is the function of the mucus in the stomach?
10. How is the upper small intestine (duodenum) protected from the acidic contents of the stomach released through the pyloric sphincter?
11. What is the function of the gall bladder?
12. What are the three sphincter muscles of the digestive system?
13. Where does most of the digestion take place?
14. Explain what is meant by absorption.
15. What four special features of the small intestine aid the absorption of food?
16. Complete the following table.

    Food substance	Enzyme	Product of digestion	Absorbed into? (Blood vessels or lymph vessels)
    Carbohydrates
    Fats and Oils
    Proteins

17. Explain the main function of the large intestine.
18. What are the main components of faeces?
19. What is the function of the rectum?
20. Complete the table

    Disorder	Organ Affected	Brief Explanation
    Appendicitis		Inflammation of this organ
    Hear-burn		Stomach contents rise up the oesophagus; acids cause burning.
    Stomach ulcers or gastric ulcers		Lining of stomach becomes raw and painful as sores develop on the lining of the stomach..
    Gallstones		Bile salts crystalise out into small solid ‘stones' that can cause severe pain.
    diarrhoea		Waste products move too quickly through preventing absorption of water resulting in very runny feces being expelled frequently.
    Constipation		Waste products move too slowly causing absorption of too much water resulting in very hard feces that are difficult to expel. Often due to too little roughage in the diet.

21. Complete the following table:

    Type of Teeth	Function	Type of Animal Found In
    Incisors
    Canines
    Premolars
    molars

22. Compare and contrast the digestive systems of herbivores, carnivores and omnivores.
23. What is the function of the caecum and appendix in some herbivores?
24. Explain why cows have several stomachs, the first of which is called the rumen.
25. How do most plants gain their food? Write a word equation.
26. Explain why some plants are carnivorous?
27. What element is lacking in the soil of these plants?
28. How do they obtain it? What part of the body contains this?

Fill in the gaps.

The process by which food is moved through the oesophagus and other parts of the digestive system is called __________________________.  The two types of digestion are ________________ and _________________.  Mechanical digestion occurs in the __________________ and ______________________.  Chemical digestion begins in the ______________________, continues in the __________________ and is completed in the ______________________.  Absorption of useful products of digestion occurs in the ____________________.  Absorption of water occurs in the _________________________.  The four features of the small intestine that allow for maximum absorption of nutrients are _________________, ____________________, ___________________________ and _______________________.  Herbivores have special adaptation for digestion of ___________________.  The only organisms that can actually break this down are ____________________.  The 3 main adaptations of herbivores include a) _____________________small intestine, b) a large _____________________ and c) ____________________ which contain _____________________.  Some herbivores have ________________.  The first of these is called the _________________.  The animal regurgitates food from here where it is re-chewed.  This is called ________________________________.