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nutrition in human beings (digestion) (small intestine (largest part of…
nutrition in human beings (digestion)
alimentary canal
long tube extending form mouth to anus
mouth
teeth
mastication of food
saliva
salivary amylase breaks down starch into simple sugars
tongue
mixes food with saliva
bolus = chewed food + saliva
peristaltic movements
the winning of the canal had muscles the contract rhythmically in order to push food forward. these movements take place all along the gut
stomach
expands when food enters
helps in mixing food with digestive juices
gastric juices
HCL
creates acidic medium for action of pepsin enzyme
kills bacteria
mucus
protects inner lining of the stomach from acidic medium
pepsin
protein digesting enzyme
exit of food regulated by spinster muscles
small intestine (largest part of alimentary canal)
receives recreations from
pancreas
pancreatic juices
trypsin
protein
lipase
emulsifies fats
amylase
starch
liver
bile salts
digests fats
bile juice
makes alkali medium
ileum
has villi
has bold vessels
mainly absorption
jejunum
intestinal juices (recreated by walls of intestine)
amylase
lipase
erypsin
duodenum
bile juice
bile salts
pancreatic juices
end products
carbohydrates into glucose &fructose
fats to fatty acids & gycerol
proteins (peptides) to amini acids
large intestine
unabsorbed food is sent into the large intestine
absorb water from undigested food
absorption using villi
waste products are removed by the anus
this exit is regulated by the the anus spinster muscles