digestion and food tests Flashcards
oespophagus
muscles push food into stomach for peristalsis
, contraction and relaxation of circular muscles
mouth
broken down physically by and chemically by saliva, saliva contains amylase breakdown of starch
stomach
food churned back and forward by peristalsis
mixed with gastric juice which contains pepsin
also has hydorchloric acid for optimum ph
ileum
very long to allow time for absorption and digestion
large surface of microvilli for rapid diffusion
villi cells one cell thick short diffusion pathway
large network of blood vessels to carry away to maintain a concentration gradient.
trypsin
caesin ta amino acids trypin as an enzyme
how long it takes to see an X
digestion
chemical and mechanical bbreakdown of food, converts large nsoluble molecule into small soluble molecules
bile
made in the liver and stored in the gall bladder
neutralises stomach acid breaks up fat into smaller globules
neutralising allows enzymes to work ay optimum rate
glucose
benedicts
green yellow low levels
red high concentration
starch
iodine ,
blue black if present
proteins
biuret solution
blue to pink purp
what does dietary fibre
aids the movement of food through the gut
Vitamin A
C
D
A: improves vision keeps skin and hair healthy
C: prevents scurvy
D: needed for calcium absorbtion
calcium
iron
bones and teeth
needed in haemoglobin
panscreas
produces protease amylase, lipase,
releases these into the small intestine
rectum
faeces is stored here
last part of the large intestine
