The Digestive System

Question 0

State the sites of production of the Mao. Digestive juices in a mammal and what they produce

Answer 0

Salivary glands- amalyse 
Stomach- pepsin
Pancreas- lipase+amalyse 
Liver- bile
Small intestine- lipase

Question 1

What is digestion

Answer 1

The breakdown of large insoluble food substances into small and soluble ones to allow absorption into the blood stream through the small intestine wall

Question 2

What is the mechanism of peristalsis

Answer 2

Circular muscles in front of the food RELAX to allow it to pass through
Circular muscles behind of the food CONTRACT to push the food down

Question 3

What are different enzymes responsible for

Answer 3

The breakdown of carbohydrates, proteins and fats

Question 4

What is the main function of the small intestine

Answer 4

To absorb the end products of digestion through its wall and then pass them into the circulatory system

Question 5

Explain how the structure of the small intestine relates to it’s function

Answer 5

Large absorbing surface area
Very long and it’s internal surface is folded and has thousands of tiny , finger like projections called VILLI
Thin walls

Question 6

Describe the role of villus and their structure

Answer 6

Suited to the jobs of absorption and transport of digested foods
Because each villus:
-is covered by a cellular lining which is one cell thick
-contains a large dense capillary network (into which glucose and amino acids pass)
-contain a tiny lymphatic vessel called a lacteals (that collects the products of fat digestion and passes them into the lymphatic system)