Which statement best explains the difference between mechanical and chemical digestion?, Mechanical digestion physically breaks food into smaller pieces, while chemical digestion changes food at the molecular level., Mechanical digestion changes food molecules, while chemical digestion only breaks food into smaller pieces., Mechanical digestion occurs only in the stomach, while chemical digestion occurs only in the mouth., Mechanical digestion requires enzymes, while chemical digestion does not., Why does chemical digestion begin in the mouth instead of the stomach?, Because saliva contains hydrochloric acid., Because proteins begin to digest in the mouth., Because saliva contains amylase, which starts breaking down starches., Because bile is released into the mouth., What would most likely happen if the epiglottis failed to close while swallowing?, Food would enter the small intestine immediately., Digestion would stop completely., Food could enter the respiratory tract, causing choking., Saliva production would increase., Which organ provides the acidic environment necessary for pepsin to function?, Small intestine, Liver, Pancreas, Stomach, Why does the stomach produce mucus?, To neutralize bile., To protect its lining from hydrochloric acid and digestive enzymes., To digest fats., To absorb nutrients., Which combination of organs sends substances into the duodenum to aid digestion?, Liver, pancreas and gallbladder, Mouth, esophagus and stomach, Liver, stomach and large intestine, Pancreas, rectum and colon, Which statement about bile is correct?, It mechanically breaks large fat droplets into smaller ones., It is produced by the pancreas., It chemically digests proteins., It contains pepsin., Why is the small intestine called "small" even though it is about 6 meters long?, Because it is shorter than the large intestine., Because it absorbs only small nutrients., Because it has a smaller diameter than the large intestine., Because it is located below the large intestine., What is the main advantage of the villi lining the small intestine?, They produce digestive enzymes., They store digested food., They produce bile., They increase the surface area for nutrient absorption., Which function is NOT performed by the pancreas?, Producing bile., Secreting digestive enzymes., Producing hormones., Neutralizing stomach acid in the duodenum., Which process mainly occurs in the large intestine?, Protein digestion., Most nutrient absorption., Absorption of water and salts., Production of gastric juice., Which statement about bacteria in the large intestine is TRUE?, They digest all carbohydrates., They produce bile., They produce vitamin B and vitamin K and help prevent infections., They destroy the villi., Which sequence correctly represents the movement of food through the digestive system?, Mouth → Esophagus → Stomach → Small intestine → Large intestine → Rectum → Anus, Mouth → Stomach → Esophagus → Small intestine → Large intestine, Mouth → Liver → Stomach → Small intestine → Anus, Mouth → Pharynx → Large intestine → Small intestine → Rectum, Which of the following is classified as a micronutrient?, Proteins, Vitamins, Lipids, Carbohydrates, Why are carbohydrates, lipids and proteins considered macronutrients?, They are required in relatively large amounts., They are only found in plants., They provide vitamins to the body., They cannot be digested., Which statement best describes an essential nutrient?, A nutrient stored in muscles., A nutrient found only in vegetables., A nutrient that provides the most calories., A nutrient the body cannot produce in sufficient amounts and must obtain from food., Why is the term "empty-calorie food" more accurate than "junk food"?, Because these foods contain no nutrients at all., Because they provide energy but relatively few vitamins and minerals., Because they contain only carbohydrates., Because they cannot be digested., Which nutrient is the preferred direct source of energy for body cells after digestion?, Fructose, Glucose, Cellulose, Glycogen, Which type of fatty acid is generally associated with a lower risk of cardiovascular disease?, Trans fatty acids., Unsaturated fatty acids., Saturated fatty acids., Hydrogenated fatty acids., Which statement correctly compares starch and glycogen?, Both are forms of dietary fiber., Starch is the storage carbohydrate in plants, while glycogen is the storage carbohydrate in animals., Starch is stored in animals, while glycogen is stored in plants., both are structural carbohydrates found in cell walls.

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