Digestion Flashcards
why do we need to eat a wide variety of foods?
to provide our bodies with all the substances that are needed
what colour does starch make iodine solution go?
navy
what is the amount of energy usually found in food packets called?
kilojoules
what can too much fat cause?
heart disease
what do our bodies need to do to make use of our food?
break it down into smaller molecules
what is digestion?
when our bodies break our food up into smaller sized molecules to make use of it
what does digestion do?
it turns insoluble substances into soluble ones
what do many of the organs of the digestive system do?
produce enzymes
what are enzymes?
chemicals that break up our food
what is putting food into our mouths called?
feeding or ingestion
what do the teeth do?
grind up the food and mix it with saliva
what do digestive juices contain?
enzymes
what is food swallowed down?
the gullet (food pipe)
what produces saliva?
salivary glands
what does saliva do?
it breaks down starch into sugar
what happens in the stomach?
strong acid is added to the food and more digestive juices are added
what do digestive juices do?
break proteins into amino acids
what happens in the small intestine?
more digestive juices are added
what are carbohydrates digested into?
sugars
where are the sugar and amino acids taken?
into the blood steam and then the small intestine
what happens to the food substances?
they are absorbed
what does the large intestine do?
removes water from the food that cannot be digested
what does food that cannot be digested form?
faeces
what is pushing faeces out of the anus called?
Egestion
