Describe the structure of a villus and the roles of capillaries and lacteals
Describe the structure of a villus and the roles of capillaries and lacteals
1 Answer
Questions and Answers For
O Level Biology
234 Questions
1 Answer Understand that assimilation is the uptake and use by cells of nutrients from the blood
Understand that assimilation is the uptake and use by cells of nutrients from the blood
1 Answer Understand that absorption (by diffusion, osmosis and active transport) is the movement of nutrients from the intestines into cells lining the digestive system and then into the blood
Understand that absorption (by diffusion, osmosis and active transport) is the movement of nutrients from the intestines into cells lining the digestive system and then into the blood
1 Answer State that the small intestine is the region where nutrients are absorbed
State that the small intestine is the region where nutrients are absorbed
1 Answer Describe peristalsis as waves of contractions of longitudinal and circular muscles which move food through the digestive system
Describe peristalsis as waves of contractions of longitudinal and circular muscles which move food through the digestive system
1 Answer Outline the role of bile in emulsifying fats to increase the surface area for the chemical digestion of fat to fatty acids and glycerol by lipase
Outline the role of bile in emulsifying fats to increase the surface area for the chemical digestion of fat to fatty acids and glycerol by lipase
1 Answer Understand that the different proteases present in the stomach and the duodenum work best at different pH levels
Understand that the different proteases present in the stomach and the duodenum work best at different pH levels
1 Answer Describe the function of hydrochloric acid in the stomach as killing ingested bacteria
Describe the function of hydrochloric acid in the stomach as killing ingested bacteria
1 Answer Describe the functions of amylase, maltase, protease and lipase, listing the substrates and endproducts, limited to: (a) amylase breaks down starch to maltose (b) maltase breaks down maltose to glucose (c) protease (pepsin and trypsin) breaks down protein to amino acids (d) lipase breaks down lipids to fatty acids and glycerol
Describe the functions of amylase, maltase, protease and lipase, listing the substrates and endproducts, limited to: (a) amylase breaks down starch to maltose (b) maltase breaks down maltose to glucose (c) protease (pepsin and trypsin) breaks down protein to amino acids (d) lipase breaks down lipids to fatty acids and glycerol
1 Answer State that physical digestion increases the surface area of food for the action of enzymes in chemical digestion
State that physical digestion increases the surface area of food for the action of enzymes in chemical digestion
1 Answer
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