B2 : Digestive Systems

Question 1

How long is the digestive system

Answer 1

9 Meters long

Question 2

What is the digestive system

Answer 2

An organ system made up of many organs that carry out digestion

Question 3

What is digestion

Answer 3

The break down of large insoluble food molecules into smaller, soluble ones

Question 4

What are the five organs that carry out digestion

Answer 4

. Salivary gland and enzymes (That produce enzymes)
. The liver (Produces bile which emulsifies fat into tiny droplets)
. Stomach ( Produces enzymes and hydrochloric acid)
. Small intestine (A muscular tube that can contract to move food along it. It also produces and secretes enzymes)
. Large intestine (Absorbs water and contains bacteria to break down any undigested food)

Question 5

What are the adaptations on the small intestine

Answer 5

. A good blood supply to maintain a steep concentration gradient
. Thin walls / membranes to provide short diffusion distance
. Lots of villi and microvilli to increase surface area

Question 6

What does emulsify mean

Answer 6

Turns fat into tiny droplets

Question 7

What is the functional difference between small and large intestines

Answer 7

Small intestine is a muscular tube that moves food along it secreting enzymes
Large intestine absorbs water and contains bacteria to break down any unbroken food

Question 8

What is the role of saliva in the mouth

Answer 8

Contains enzymes to break down food