IB SEHS TEST (OPTION D: NUTRITION FOR SPORT,EXERCISE
AND HEALTH) ACTUAL 2025/2026 WITH 16 QUESTIONS AND
VERIFIED ANSWERS GRADED A+
D.1.1: Outline the features of the principal components of the digestive system
Mouth: locations of both mechanical and chemical digestion
Esophagus: peristalsis action to move food to stomach
Stomach: has rugae lumen and mucous coating; has mechanical and chemical
(hydrochloric acid) digestion
Small Intestine: villi and micro-villi to increase area for absorption
Large Intestine: water balance and viatmin absorption
Pancreas: sends digestive enzymes into the SI
Liver: prouces bile (breaks down fat)
Gall Bladder: stores bile when no nee to digest fat (ex- fasting)
Kindeys: water retention and water loss
D.1.2.: State the typical pH values of the digestive organs:
Mouth: 5.5 to 7.5
Stomach: 1.0 to 4.0
Small Intestine: 6.0 to 8.0
D.1.3: Describe the function of enzymes in the context of macronutrient
digestion: (include optimum temp & pH)
enzymes (aka catalyst) are proteins that speed up the process of digesting macronutrients
- activity is highest when it is the optimum temperature & pH
- each reaction needs a specific enzyme
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