Choose the best answer.

1			Most blood from the brain flows down the internal jugular veins and then into
			A)	the external jugular veins.
			B)	the vertebral veins.
			C)	the subclavian veins.
			D)	the brachiocephalic veins.
2			The anterior and posterior communicating arteries are found in
			A)	the neck.
			B)	the circle of Willis.
			C)	the branches of the celiac trunk.
			D)	the elbow.
3			All of the following are supplied by branches of the celiac trunk except
			A)	the spleen.
			B)	the liver.
			C)	the small intestines.
			D)	the stomach.
4			At any given moment, most of the body's blood is in
			A)	the veins.
			B)	the arteries.
			C)	the heart.
			D)	the capillaries.
			E)	the lungs.
5			Which of the following does not increase the risk of atherosclerosis?
			A)	smoking
			B)	sedentary lifestyle
			C)	a high-fiber diet
			D)	stress
			E)	a diet high in cholesterol
6			Vesalius experimentally demonstrated that blood circulates through the body.
			A)	True
			B)	False
7			The hepatic portal vein receives blood from all of the following except
			A)	the splenic vein.
			B)	the superior mesenteric vein.
			C)	the pancreatic vein.
			D)	the hepatic veins.
8			What layer of the vessel wall facilitates vasoconstriction and vasodilation?
			A)	the tunica externa
			B)	the tunica adventitia
			C)	the tunica interna
			D)	the tunica media
9			What is the function of the ductus venosus?
			A)	It is a shunt between the right and left atria that bypasses the fetal lungs.
			B)	It is a shunt that flows between the umbilical vein and inferior vena cava and bypasses the liver.
			C)	It is a shunt between the umbilical vein and aorta that rapidly passes maternal blood to the fetus.
			D)	It is a shunt between the pulmonary trunk and the aorta that bypasses the fetal lungs.
10			Which of the following is associated with veins but not arteries?
			A)	a tunica media with abundant smooth muscle
			B)	continuous endothelium
			C)	a tunica media with abundant elastic fibers
			D)	valves
11			To get from the subclavian artery to the brachial artery, blood must flow through the axillary artery.
			A)	True
			B)	False
12			Four pulmonary arteries empty into the left atrium of the heart.
			A)	True
			B)	False
13			Fenestrated capillaries are the most common type of capillary in the body.
			A)	True
			B)	False
14			The layer of a vessel wall that contains smooth muscle is the tunica adventitia.
			A)	True
			B)	False
15			The ductus arteriosis is the fetal shunt between the umbilical vein and inferior vena cava.
			A)	True
			B)	False