GRE Subject Test: Biology : Understanding Digestive Structures

Study concepts, example questions & explanations for GRE Subject Test: Biology

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Example Questions

Example Question #1 : Understanding Digestive Structures

What organ releases digestive enzymes into the duodenum?

Possible Answers:

Gall bladder

Liver

Spleen

Pancreas

Correct answer:

Pancreas

Explanation:

The majority of chemical (enzymatic) digestion occurs in the duodenum, the first segment of the small intestine. Proteases, amylase, lipases, and other enzymes are secreted into the duodenum from the pancreas. These enzymes are used to digest proteins, carbohydrates, and lipids, respectively.

The liver produces bile, which is stored in the gall bladder. During digestion, bile is released to help emulsify fats for digestion. The spleen is part of the lymphatic system, and is not involved in digestion.

Example Question #2 : Understanding Digestive Structures

Which organ is responsible for releasing the majority of digestive enzymes into the small intestine?

Possible Answers:

Pancreas

Stomach

Gall bladder

Liver

Correct answer:

Pancreas

Explanation:

The small intestine is the primary site of digestion and absorption in the body. This chemical digestion is possible thanks to the digestive enymes secreted by the pancreas.

Example Question #3 : Understanding Digestive Structures

Which of the following is NOT a function of the liver?

Possible Answers:

Drug detoxification

Bile storage

Creation of proteins in the plasma

Bile formation

Correct answer:

Bile storage

Explanation:

While it is true that the liver creates and secretes bile, storage of bile is accomplished by the gall bladder.

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