Question

the digestive system
label the diagram. then, fill in the table.
part of digestive system describe what is happening at this stage of digestion.

1. mouth

2.
3.
4.

1. anus

1 tissues, organs, and systems 978 - 0 - 07 - 031869 - 4

Explanation:

1. Mouth: Chewing (mechanical digestion) and salivary enzymes (like amylase) start breaking down carbohydrates (chemical digestion).
2. Stomach: Churning (mechanical digestion). Gastric juices (hydrochloric acid and pepsin) break down proteins (chemical digestion).
3. Small Intestine: Villi absorb nutrients (like amino - acids from protein digestion, glucose from carbohydrate digestion, fatty acids from lipid digestion) into the bloodstream. Enzymes from the pancreas (e.g., pancreatic amylase, lipase, trypsin) and small intestine (e.g., maltase, peptidases) complete chemical digestion.
4. Large Intestine: Absorbs water and electrolytes from undigested food, forming feces.
5. Anus: Expels feces (undigested waste) from the body.

Answer:

1. Mouth: Chewing (mechanical) and salivary enzyme (chemical) digestion of carbs.
2. Stomach: Churning (mechanical) and gastric juice (chemical) digestion of proteins.
3. Small Intestine: Nutrient absorption and completion of chemical digestion by pancreatic and intestinal enzymes.
4. Large Intestine: Water and electrolyte absorption, feces formation.
5. Anus: Feces expulsion.