Digestive System Activity and Food Experiment

Study Notes

Digestive System Activity

The digestive system processes food, breaking down complex molecules into absorbable nutrients
Food is moved through the digestive tract using muscular contractions called peristalsis
Saliva contains amylase, an enzyme that breaks down starch into simple sugars
The stomach secretes hydrochloric acid and pepsin, aiding protein digestion
The stomach lining is protected by mucus to prevent damage from acid
The small intestine absorbs nutrients into the bloodstream
The large intestine absorbs water and prepares waste for elimination
The digestive system is vital for providing the body with energy and nutrients.

Food Digestion Experiment

Experiment involving starch solution, saliva, and iodine solution
Two test tubes (A and B) were used to test the effect of saliva on starch
Tube A contained saliva and starch
Tube B contained only starch
Iodine solution was added to both tubes to observe color change.
A color change indicates the presence of starch

Digestion Process

Food is chewed and mixed with saliva in the mouth (buccal cavity)
Saliva moistens the food and contains an enzyme (amylase) to break down starch into sugar
Food is passed through the oesophagus to the stomach
The stomach wall churns, mixes with gastric juices that contain hydrochloric acid and pepsin, a protein-digesting enzyme.
The acidic environment activates pepsin.
Mucus protects the stomach wall from acid
The food then moves to the small intestine, where more enzymes break down food into the absorbable nutrients.
The large intestine absorbs water from the undigested food and prepares waste for elimination

Description

This quiz focuses on the digestive system's function and the food digestion experiment. It covers the processes of digestion, the role of enzymes, and an experiment demonstrating the effect of saliva on starch. Test your understanding of these essential concepts in nutrition and biological processes.