Lactase

Definition

Lactase is an enzyme produced in the small intestine that breaks down lactose, a sugar found in milk and dairy products. It is essential for proper digestion of dairy foods.

5 Must Know Facts For Your Next Test

1. Lactase deficiency leads to lactose intolerance, causing symptoms like bloating and diarrhea.
2. The production of lactase decreases with age in most humans, which can lead to adult-onset lactose intolerance.
3. Lactase supplements are available for individuals who are lactose intolerant.
4. Lactase activity is highest right after birth and tends to decline as one ages.
5. Certain populations, such as those of Northern European descent, have a higher prevalence of lactase persistence into adulthood.

Review Questions

• What role does lactase play in carbohydrate digestion?
• What are common symptoms of lactase deficiency?
• Why might some adults be more likely to retain lactase activity than others?

Related terms

Lactose:

A disaccharide sugar found in milk and dairy products, composed of glucose and galactose.

Lactose Intolerance: A condition where the body cannot properly digest lactose due to insufficient levels of lactase enzyme.

Disaccharides:

Carbohydrates composed of two monosaccharides; examples include lactose, sucrose, and maltose.