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Nutrition Activity 3 part 1
Mouth
Add water to the biscuit drop by drop until it is soft.
Mash the biscuit so it can be rolled into small balls that can fit into the straw.
What does the water represent?
What does the mashing in your mouth?
What can be found in saliva that isn't in the water you added?
Oesophagus
Roll the food into small balls. Each ball is called a bolus (plural = boli)
Squeeze the balls in from one end of the straw to the other
Squeeze the bolus out of the straw and into the ziploc bag.
What does the ziploc bag represent?
What process is represented by squeezing the straw to move the bolus out?
Stomach
Ensure all the food is in the ziploc bag.
Add 10 cm3 of gastric juice into the bag.
Remove as much air as possible and seal the bag.
Mix the food and the gastric juice lightly with your hands.
Your stomach churns food, just like you pressed the biscuit in the bag. Is that a form of digestion?
Yes
No
What does the gastric juice do to the food?
Small intestine
Tear the old worksheet into a square, and fold it into half twice.
Place it on top of the cup so it acts as a filter.
Pour the stomach contents into the filter
Add twice the volume of bile + pancreatic juice + intestinal juice to the filter
Use red and blue litmus paper to determine the pH of the filtrate
What is the optimal pH in the duodenum?
acidic
neutral
alkaline
What enzymes are present in pancreatic and intestinal juice?
amylase
maltase
protease
lipase
What do the filter and filtrate represent?
On a scale of 1 to 5, with 5 being the best, how accurate a model of the digestive system was this activity?
1
2
3
4
5
State one way the model can be improved.
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