Summary
Amylase, proteases and lipases break carbohydrates, proteins and fats into absorbable units.
In depth
Salivary amylase starts starch digestion; pepsin digests proteins in acid; pancreatic amylase, lipase and trypsin work in the duodenum at about pH 8; brush border enzymes finish digestion. Bile emulsifies fat.
Enzymes are secreted as inactive precursors (zymogens) to protect tissues. Bile is not an enzyme but aids fat digestion. pH optima differ.
Common mistake: no digestion of carbohydrate occurs in the stomach, because salivary amylase is inactivated by acid.
Frequently asked questions
What is Digestive Enzymes?
Amylase, proteases and lipases break carbohydrates, proteins and fats into absorbable units.
Which area of biology covers Digestive Enzymes, and how advanced is it?
Digestive Enzymes is one of the 51 topics in Human Physiology. It is rated Intermediate, so it suits learners who already know the core vocabulary. Related topics in this area include Digestive System, Small Intestine Absorption, Nutrition and Diet.
Can you give an example of Digestive Enzymes?
Lipase breaks triglycerides into fatty acids and glycerol.
What should I learn before Digestive Enzymes?
Work through the Beginner topics in Human Physiology first, such as Homeostasis, Tissues and Organs, Skeletal System, then return to Digestive Enzymes. Intermediate topics assume the Beginner vocabulary.
What topics are related to Digestive Enzymes?
The closest topics to Digestive Enzymes are Digestive System, Small Intestine Absorption, Nutrition and Diet, Gut Hormones. Comparing them side by side is a good way to see how the ideas connect.
How can I check that I understand Digestive Enzymes?
Read the summary and the in-depth section, then use the quick check on the interactive lesson for Digestive Enzymes. To practise the whole of Human Physiology, use the Human Physiology quiz.
How is Digestive Enzymes different from Digestive System?
Digestive Enzymes: Amylase, proteases and lipases break carbohydrates, proteins and fats into absorbable units. Digestive System: The mouth, stomach, intestines and accessory organs that break down food and absorb nutrients. Read both side by side and note what each one explains.
What is a common mistake about Digestive Enzymes?
No digestion of carbohydrate occurs in the stomach, because salivary amylase is inactivated by acid.
How should I study Digestive Enzymes step by step?
First, read the summary and write the definition in your own words. Second, read the in-depth section and note any example. Third, compare it with Digestive System and explain the difference aloud. Finally, take the Human Physiology quiz and come back to this page for any question you miss.