AQA A-level BIOLOGY 7402/2 Paper 2

AQA A-level BIOLOGY 7402/2 Paper 2 Question Paper & Mark scheme June 2023 VERIFIED100%. Chemical digestion - -Hydrolyses large, insoluble molecules What is digestion - -Physical breakdown Chemical digestion Physical breakdown - --Breakdown of food into absorbable nutrients - By teeth - Stomach muscles - increases SA What is the importance of digestion? - -Hydrolyses large food molecules into smaller molecules Which can move across cell membrane And be absorbed into the blood Oesphagus - -carries food from mouth to stomach. adapted for transport. made up of a thick muscular wall What is hydrolysis? - -Breaking bonds by adding water stomach - -muscular sac between the oesphagus and the small intestine where digestion of food begins produces enzymes ileum - -Part of small intestine Long muscular tube Enzymes from walls and glands digest food Inner walls folded for large SA (have microvilli) large intestine - -Absorbs water and forms feces Rectum - -stores feces Salivary glands - -Contain amylase to hyrdolyse starch into maltose Pancreas - -Pancreatic juice (hydrolyse proteins, lipids and starch)