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Q:l Listl thel contentl ofl feces.
Answer:
Fecesl arel aboutl 75%l waterl andl 25%l solidl matterl containingl intestinall bacteria,l undigestedl plantl material,l fats,l bilel pigments,l inorganicl material,l mucus,l andl deadl intestinall cells.
Q:l Namel thel 4l mainl functionsl performedl byl thel digestivel system.
Answer:
Thel digestivel systeml hasl fourl mainl rolesl thatl itl performs:l ingestion,l digestionl (bothl mechanicall andl chemical),l absorption,l andl defecation.
Q:l Whatl digestivel systeml functionsl arel carriedl outl byl thel mouth?
Answer:
Ingestionl andl Digestion.
Q:l Explainl whichl digestivel systeml functionsl arel carriedl outl byl thel stomach.
Answer:
Inl thel stomachl mechanicall digestionl continuesl asl musclesl churnl andl mixl thel food,l breakingl itl intol smallerl piecesl inl thel forml ofl chimel whichl isl movedl tol thel smalll intestinel byl peristalsis.l Chemicall digestionl continuesl asl pepsinl digestsl proteins.
BIOLl251/l BIOL251l Modulel 3l W/Labl
Exam:l (Latestl 2026/l 2027l Update)l 100%l
Verifiedl Questionsl &l Answersl |l Gradel A 1 / 3
Q:l Explainl whichl digestivel systeml functionsl arel carriedl outl byl thel smalll intestine.
Answer:
Inl thel smalll intestinel chemicall digestionl continuesl asl enzymesl froml thel pancreaticl juicesl breakl downl starchesl andl proteins,l andl beginl digestionl ofl fat.l Mechanicall digestionl continuesl asl bilel breaksl downl fatl intol smallerl pieces.l Absorptionl beginsl asl digestedl foodl molecules,l waterl andl fatl arel absorbedl intol thel bloodstream.
Q:l Explainl thel twol mainl hormonesl thatl arel responsiblel forl hungerl andl satiety.
Answer:
)Leptinl andl Ghrelin.l Leptinl isl producedl byl adiposel tissuel (fatl cells).l Thel rolel ofl leptinl isl tol alertl thel brainl tol turnl offl thel hungerl centerl inl thel brainl andl activatel thel satietyl centerl whenl consumingl al meal.l Ghrelinl isl producedl byl thel stomachl andl hasl thel oppositel role.l Ghrelinl travelsl tol thel brainl andl stimulatesl thel hungerl centerl asl itl deactivatesl thel satietyl center.l Ideally,l leptinl andl ghrelinl workl togetherl tol balancel hungerl andl satiety.
Q:l Listl thel 5l biochemicall materialsl neededl byl thel bodyl thatl arel foundl inl food.
Answer:
Carbohydrates,l proteins,l andl lipidsl arel thel majorl biochemicall substancesl foundl inl foodl neededl byl thel bodyl inl largel amounts.l Vitaminsl andl mineralsl arel alsol neededl inl al muchl smallerl amount.
Q:l Whatl arel thel 2l classesl ofl carbohydratesl andl inl whatl foodsl canl eachl bel found?
Answer:
Carbohydratesl arel classifiedl asl starchesl andl sugars.l Milkl andl fruitsl suchl asl applesl orl peachesl containl sugar,l whilel grainsl suchl asl wheatl andl vegetablesl suchl asl potatoesl containl starches.
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Q:l Whatl arel thel 3l classesl ofl lipids?
Answer:
)Lipidsl canl bel dividedl intol threel categories:l saturatedl fat,l unsaturatedl fat,l andl cholesterol.
Q:l Whatl arel thel 2l classesl ofl proteinsl andl inl whatl foodsl canl eachl bel found?
Answer:
Proteinsl canl bel categorizedl asl completel orl incompletel proteins.l Examplesl ofl completel proteinsl arel meat,l poultry,l eggs,l milkl orl dairyl products,l andl soybeans;l whereas,l examplesl ofl incompletel proteinsl arel grains,l legumes,l seeds,l andl nuts.
Q:l Whatl isl thel definitionl ofl anl essentiall aminol acid,l howl manyl essentiall aminol acidsl arel therel forl adultsl andl wherel canl theyl bel found?
Answer:
Therel arel ninel aminol acidsl calledl essentiall aminol acidsl requiredl inl anl adultl humanl dietl sincel thel bodyl isl unablel tol makel thesel aminol acids.l Completel proteinsl containl alll ninel essentiall aminol acids.
Q:l Whatl arel thel 2l classesl ofl vitamins?l Howl isl al vitaminl differentl thanl al carbohydrate,l lipidl orl protein?l Whyl canl ingestionl ofl excessivel amountsl ofl onel typel ofl vitaminl bel dangerous?
Answer:
Thel 2l classesl ofl vitaminsl arel water-solublel vitaminsl andl fat-solublel vitamins.l Vitaminsl arel organicl compoundsl thatl arel notl consumedl inl metabolicl reactionl butl helpl enzymesl carryl outl thel metabolicl reactionsl whichl convertl nutrientsl tol materialsl needl byl thel body.l Fat-solublel vitaminsl arel storedl inl bodyl fatl andl ingestionl ofl excessivel amountsl canl bel problematic.
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