digestion DEFINITELY IN EXAM

Question 1

define tissue

Answer 1

a group of cells with a similar structure/ function

Question 2

define an organ

Answer 2

a group of tissues working together for a specific function (e.g: the stomach)

Question 3

define an organ system

Answer 3

a group of organs that work together to form organisms

digestive system

Question 4

what 3 main nutrients does food contain

Answer 4

carbohydrates (starch)
protein
lipids (fats)

Question 5

role of the mouth in digestion

Answer 5

teeth grind food and make it into smaller pieces

enzymes in the saliva begin to digest starch into sugar

Question 6

role of the stomach in digestion

Answer 6

in the stomach enzymes begin the digestion of proteins + also contains hydrochloric acid which helps digestion of proteins
churning action of stomach muscles turns food into a fluid which increases the surface area for enzymes to digest

Question 7

role of small intestine in digestion

Answer 7

chemicals released into the small intestine from the liver and the pancreas
pancreas releases enzymes that continue the digestion of starch and protein and start the digestion of lipids
the liver releases bile which helps to speed up the digestion of lipids, and neutralises the acid released from the stomach
walls of small intestine release enzymes to continue the digestion of proteins and lipids

Question 8

where are the smaller food molecules produced in digestion absorbed into and by what process

Answer 8

small molecules from digestion are absorbed into the bloodstream by diffusion or active transport

Question 9

what are the products of digestion used for

Answer 9

to build new carbohydrates, lipids and proteins

some of the glucose produced is used in respiration

Question 10

what is metabolism controlled by?

Answer 10

metabolism is controlled by enzymes