1) Which of the following is an accessory organ in the digestive system?

A) the skin

B) the lungs

C) the pancreas

D) the kidneys

2) Blood carries most nutrients straight from the small intestine to which organ?

A) the heart

B) the liver

C) the kidneys

D) the stomach

E) the pancreas

3) Digestion of which organic molecule takes a somewhat more complicated route than most nutrients?

A) carbohydrate

B) fat

C) protein

D) nucleic acid

A) muscularis externa.

B) submucosa.

C) serosa.

D) mucosa.

5) Which layer of the digestive tract is actually in contact with the food?

A) muscularis externa

B) submucosa

C) serosa

D) mucosa

6) Most of the blood vessels and nerves in the digestive tract are located in the layer of:

A) muscularis externa.

B) submucosa.

C) serosa.

D) mucosa.

7) Which type of muscle is involved in peristalsis in the intestine?

A) cardiac

B) skeletal

C) smooth

D) voluntary

8) In the digestive system, the villi are:

A) muscles in the digestive system that push the food along.

B) finger-like projections of the mucosa.

C) glands that release digestive enzymes.

D) blood vessels that pick up nutrients from the digestive system.

9) How do fats leave the digestive system and enter the bloodstream?

A) in the veins

B) in the capillaries

C) in the arteries

D) in the lymphatic vessels

10) Chemical digestion begins in the:

A) mouth.

B) stomach.

C) large intestine.

D) small intestine.