Choose the best answer

1			All of the following have one-way digestive systems except Need a Hint?
			A)	a nematode.
			B)	a planarian.
			C)	an earthworm.
			D)	a human.
2			Intestines of herbivores are _____________ compared to carnivores. Need a Hint?
			A)	longer
			B)	shorter
			C)	about the same size
			D)	less convoluted
3			When a mammal swallows, the food is prevented from going up into the nasal cavity by the Need a Hint?
			A)	esophagus.
			B)	tongue.
			C)	soft palate.
			D)	epiglottis.
4			The first site of protein digestion in the digestive system is Need a Hint?
			A)	in the mouth.
			B)	in the esophagus.
			C)	in the stomach.
			D)	in the small intestine.
5			How is the digestion of fats different from that of proteins and carbohydrates? Need a Hint?
			A)	Fat digestion occurs in the small intestine, and the digestion of proteins and carbohydrates occurs in the stomach.
			B)	Fats are absorbed into the cells as fatty acids and monoglycerides but are then modified for absorption into the blood; amino acids and glucose are not modified further.
			C)	Fats enter the hepatic portal circulation, but digested proteins and carbohydrates enter the lymphatic system.
			D)	Digested fats are absorbed in the large intestine, and digested proteins and carbohydrates are absorbed in the small intestine.
6			The primary function of the large intestine is Need a Hint?
			A)	the breakdown and absorption of fats.
			B)	the absorption of vitamin K.
			C)	the absorption of water.
			D)	the concentration of solid wastes.
7			The _____________ secretes digestive enzymes and bicarbonate solution into the small intestine to aid digestion. Need a Hint?
			A)	pancreas
			B)	liver
			C)	gallbladder
			D)	All of these are correct.
8			Which of the following represents the action of insulin? Need a Hint?
			A)	increases blood glucose levels by the hydrolysis of glycogen
			B)	increases blood glucose levels by stimulating glucagon production
			C)	decreases blood glucose levels by forming glycogen
			D)	increases blood glucose levels by promoting cellular uptake of glucose
9			Gastrin functions by Need a Hint?
			A)	enhancing the secretion of HCl in the stomach.
			B)	enhancing the secretion of pepsinogen in the stomach.
			C)	a negative feedback loop.
			D)	all of these.
10			Essential organic substances that are used in only tiny amounts by the body are called Need a Hint?
			A)	trace elements.
			B)	vitamins.
			C)	hormones.
			D)	minerals.