An example of mechanical digestion includes
a. activity of salivary amylase in the mouth.
b. churning and mixing of food in the sto-mach.
c. action of bile breaking fats into smaller droplets.
d. effects of secretin in stimulating the pan-creas to release bicarbonate.
B
Churning and mixing of food in the stomach is an example of mechanical digestion because it causes physical breakdown of the food. Salivary amylase and secretin are enzymes that cause chemical breakdown of food; bile causes emulsification of the fats.
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