20.1 General Anatomy of the Blood Vessels

1			The smooth muscle in the walls of blood vessels is found in which of the following layers?
			A)	tunica adventitia
			B)	tunica media
			C)	tunica intima
			D)	All of the above.
2			There is not enough blood in the body to fill the entire vascular system at once. About how much of the body's capillaries is closed at any given time?
			A)	1/4
			B)	1/3
			C)	1/2
			D)	3/4

20.2 Blood Pressure, Resistance, and Flow

3			Hypertension is a chronic resting blood pressure higher than which of the following?
			A)	140/70
			B)	120/80
			C)	130/70
			D)	140/90
4			Vasodilation may be brought about by
			A)	histamine.
			B)	high blood oxygen.
			C)	high blood carbon dioxide.
			D)	angiotensin II.

20.3 Capillary Exchange

5			The most important mechanism of exchange between blood and tissue fluid is ________________.
			A)	transcytosis
			B)	diffusion
			C)	filtration
			D)	active transport

20.4 Venous Return and Circulatory Shock

6			The venous return of blood back to the heart is encouraged by
			A)	constriction of veins in the legs.
			B)	a drop in internal pressure in the abdomen during inhalation.
			C)	relaxation of skeletal muscle.
			D)	gravity acting on the large veins above the heart.

20.7 Systemic Vessels of the Axial Region

7			The abdominal aorta terminates by dividing into the
			A)	external iliac arteries.
			B)	internal iliac arteries.
			C)	common iliac arteries.
			D)	femoral arteries.
8			Which of the following is not a branch of the abdominal aorta?
			A)	intercostal arteries
			B)	celiac artery
			C)	renal arteries
			D)	common iliac arteries
9			The right common carotid receives its blood from this artery directly.
			A)	right subclavian
			B)	brachiocephalic
			C)	aorta
			D)	right cerebral

20.8 Systemic Vessels of the Appendicular Region

10			The artery which is the continuation of the femoral artery after it passes to the posterior side of the thigh is the
			A)	posterior femoral.
			B)	posterior tibial.
			C)	popliteal.
			D)	peroneal.