Paper 1 - Nutrition in Animals

Question 1

order of journey through alimentary canal

Answer 1

food into mouth
mouth chews (mechanical digestion) and creates bolus of food
enzymes eg amylase in mouth also do chemical digestion
bolus swallowed down oesophagus 
into stomach
mechanical and chemical digestion
into small intestine for absorption with villi
into large intestine for absorption of water
into rectum stored before egestion
anus is exit point

Question 2

function of mouth

Answer 2

mechanical digestion to break food into bolus for larger surface area for optimum enzyme activity

chemical digestion from enzymes such as amylase

Question 3

function of stomach

Answer 3

mechanical digestion

chemical digestion from enzymes

Question 4

purpose of hcl in stomach

Answer 4

kills bacteria

provides optimum pH for enzyme activity

Question 5

purpose of bile

Answer 5

neutralise stomach acid for optimum pH of enzymes in small intestine

emulsifies fats - bigger surface area so digestion is faster by enzymes

Question 6

where is bile produced and where is it stored

Answer 6

produced in the liver, stored in gall bladder

Question 7

what is peristalsis

Answer 7

the contraction of muscular tissue in the gut which help move boluses of food through the alimentary canal

Question 8

where is duodenum

Answer 8

first part of the small intestine

Question 9

where is the ileum

Answer 9

second part of the small intestine

Question 10

function of pancreas

Answer 10

produces protease, lipase and amylase which are secreted into small intestine