digestion

Question 1

what is digestion?

Answer 1

the process which the body breaks down food into smaller and simple substances. These substances are absorbed and used by cells in the body

Question 2

what are the 2 types of digestion?

Answer 2

mechanical digestion and chemical digestion

Question 3

explain mechanical digestion

Answer 3

-mastication ( chewing , mashing , breaking ) of food into smaller particles .
-in the mouth , the teeth cut and grind food .rolling action of tongue and secretion of saliva roll food into bolus.
-Bolus is swallowed and transported into the pharynx to stomach by waves of rhythmic contractions of the oesophagus.this process is called peristalsis

Question 4

explain chemical digestion

Answer 4

-breaks food into smaller particles by enzyme
-involves hydrolysis process + water
-ex:amylase hydrolyses turn starch into maltose

Question 5

the function of these body parts :
-mouth
-liver
-gall bladder
-duodenum
-large intestine
-salivary glands
-stomach
-pancreas
-small intestine
-anus

Answer 5

-chews food
-produces bile
-stores bile
receives bile and pancreatic juice for digestion
-reabsorbs water from undigested food
-secrete salivary amylase (in saliva)
-secretes hydrochloric acid , protease and rennin
-secretes pancreatic juice
-absorbs digested food
-remove faeces