Lactose Intolerance in Humans Is the Inability to Digest a Specific

question 34

Multiple Choice

Lactose intolerance in humans is the inability to digest a specific sugar found in milk and some milk-derived dairy products. This milk sugar is called lactose, and it is broken down into two simple sugars, glucose and galactose, by the enzyme lactase. Symptoms of this disease, which occur after a person consumes significant amounts of lactose, include abdominal bloating and cramps as well as diarrhea and nausea. Many mammalian species become lactose intolerant shortly after weaning. At this time, the gene that produces lactase becomes inactive so that the enzyme is no longer produced. However, some human populations (approximately 25 percent of all adults) have developed lactase persistence, in which lactase is continually produced throughout adulthood. Milk often contains fats as well as sugars. Fats require secretions from the __________ before they can be fully digested and absorbed.

• A) gallbladder
• B) small intestine
• C) pancreas
• D) liver

---

Definitions:

Integument

Another term for the skin, which is the body's largest organ and serves as a protective barrier.

Malnourished

A condition where an individual's diet does not provide sufficient nutrients for health and well-being.

Immobile

Incapable of moving or being moved.

Moderate-intensity

A level of physical activity or exercise that raises the heart rate and induces sweating while allowing an individual to maintain a conversation.