Where does most nutrient absorption happen in the digestive system?
AMouth
BStomach
CSmall intestine
DLarge intestine
The small intestine is where most nutrients are absorbed into the bloodstream. Its inner surface is covered with tiny finger-like projections called villi that increase the surface area for absorption. The mouth begins digestion, the stomach breaks food down further, and the large intestine absorbs water.
Question 2 True / False
The stomach is where most nutrients are absorbed into the blood.
TTrue
FFalse
Answer: False
The stomach primarily breaks down food through acid and enzymes, but it absorbs very few nutrients. Most absorption happens in the small intestine, which has a huge surface area thanks to its length and the villi lining its walls.
Question 3 Short Answer
Explain the difference between mechanical digestion and chemical digestion, and give one example of each.
Think about your answer, then reveal below.
Model answer: Mechanical digestion is the physical breaking of food into smaller pieces, like chewing in the mouth or churning in the stomach. Chemical digestion is the use of chemicals like acids and enzymes to break food molecules into simpler substances, like stomach acid breaking down proteins.
Both types work together — mechanical digestion increases the surface area of food so that chemical digestion can work more efficiently. This is similar to how crushing a sugar cube helps it dissolve faster in water.