4. The esophagus is the first organ in the digestive tract that secretes digesti

Question

4.

The esophagus is the first organ in the digestive tract that secretes digestive enzymes to begin the chemical (molecular) breakdown of food.

Select one:

True

False

5.

Gastric ulcers are often caused by bacterial infection.

Select one:

True

False

6.

Lactose intolerance causes gas, bloating and stomach aches because undigested sugar molecules, called lactose, end up getting digested by bacteria in the intestines. When they digest it, they produce lots of gases.

Select one:

True

False

7. The lower esophageal sphincter prevents food in the stomach from backing up into the esophagus.

Since the esophagus is not equipped to handle the harsh acids in the stomach, when food (mixed with stomach acids) does back up into the esophagus, you get symptoms such as heart burn. This is called gastroesophageal reflux (or "reflux").

When reflux is left untreated for many years, the person becomes a trisk for esophageal cancer. This is because the esophagus gets "burned" by the acids over and over again which can eventually trigger the development of cancerous cells.

Select one:

True

False

8.

Peristalsis is defined as the rhythmic contractions of the digestive system that pushes food along the digestive tract.

Select one:

True

False

Explanation / Answer

4. False. Mouth is the first organ to produce salivary enzymes that start the digestion process.

5. True. Helicobacter pylori is considered to be the most common cause.

6. True. lactose is milk sugar

7. True. All the given statements are true

8. True. Food is moved down stomach by muscular contractions.

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