Please answer all questions

1		The circulatory system has ______ types of blood vessels.
			A)	one
			B)	two
			C)	three
			D)	four
2		______ are small arteries that retain a few muscles fibers.
			A)	Venules
			B)	Capillaries
			C)	Veins
			D)	Arterioles
3		What structure within a capillary bed shunts blood from arteriole to venule?
			A)	precapillary valve
			B)	endothelium
			C)	precapillary sphincter
			D)	pericardium
			E)	shunt valve
4		What is the function of valves in veins?
			A)	Valves increase the rate of blood flow.
			B)	Valves prevent the backward flow of blood.
			C)	Valves only occur in the heart.
5		The ______ can act as a blood reservoir.
			A)	veins
			B)	lungs
			C)	heart
			D)	capillaries
6		The inner surface of the heart is lined with ______ .
			A)	exocardium
			B)	isocardium
			C)	endocardium
			D)	pericardium
7		The heart valves that are supported by chordae tendinae are the _____________.
			A)	semilunar valves
			B)	atrioventricular valves
			C)	only the biscuspid valve
			D)	All of the above are correct.
8		The venae cavae carry low-oxygen blood to the ______ of the heart.
			A)	right ventricle
			B)	right atrium
			C)	left ventricle
			D)	left atrium
9		The left ventricle sends oxygenated blood into the ______ to be distributed throughout the body.
			A)	vena cava
			B)	pulmonary artery
			C)	aorta
			D)	pulmonary vein
10		The "dup" sound occurs when the ______ valves close.
			A)	atrioventricular
			B)	venous
			C)	inferior venae cavae
			D)	semilunar
11		The ______ node initiates the heartbeat.
			A)	AV (atrioventricular)
			B)	SL (slow-wave)
			C)	SA (sinoatrial)
			D)	IVC (interventricular)
12		The AV node signals ____________ .
			A)	the atria to contract
			B)	the ventricles to contract
			C)	both A and B
13		The ______ wave of an electrocardiogram represents excitation and impending contraction of the atria.
			A)	P
			B)	S
			C)	T
			D)	QRS complex
14		The alternating expansion and recoiling of an arterial wall can be felt as ______ .
			A)	pressure
			B)	flow
			C)	a pulse
			D)	a vibration
15		______ pressure occurs when the ventricles are relaxing.
			A)	Systolic
			B)	Diastolic
			C)	Pulmonary
			D)	Ventricular
16		Blood pressure ______ with distance from the left ventricle.
			A)	decreases
			B)	increases
			C)	stays the same
			D)	increases, then decreases
17		The largest artery in the systemic circuit is the ______ .
			A)	anterior vena cava
			B)	pulmonary vein
			C)	aorta
			D)	femoral artery
18		The ______ arteries serve the heart muscle.
			A)	femoral
			B)	hepatic
			C)	iliac
			D)	coronary
19		A portal system, such as the hepatic portal system, begins and ends within ______ .
			A)	arteries
			B)	veins
			C)	capillaries
			D)	iliac vessels
20		Hypertension and atherosclerosis are associated with ______.
			A)	stroke
			B)	heart attack
			C)	aneurysm
			D)	all of the above
21		The lymphatic system _________.
			A)	takes up excess tissue fluid and returns it to the bloodstream
			B)	absorbs fats in the intestinal villi and transports them to the bloodstream
			C)	helps to defend the body against disease
			D)	does all of the above
22		Small, round structures that cleanse the lymph of debris and pathogens are called________.
			A)	lymphatic capillaries
			B)	lymph nodes
			C)	lymph valves
			D)	lacteals
23		The _______ is located in the upper abdominal cavity and cleanses the blood in much the same way as lymph nodes cleanse lymph.
			A)	spleen
			B)	pancreas
			C)	thymus
			D)	gall bladder
24		The two components of the cardiovascular system are __________.
			A)	the heart and the aorta
			B)	the heart and all the arteries
			C)	the heart and the blood vessels
			D)	the blood vessels and the lymphatic system
25		A wall called the _______ separates the heart into the right side and left side.
			A)	chordae tendineae
			B)	valves
			C)	pulmonary trunk
			D)	septum
26		These vessels carry oxygen-rich blood to the left atrium.
			A)	pulmonary veins
			B)	pulmonary arteries
			C)	coronary arteries
			D)	coronary veins
27		One possible cause of a faulty AV valve is
			A)	scarlet fever
			B)	meningitis
			C)	rheumatic fever
			D)	small pox virus
28		Venous return is dependent upon__________.
			A)	skeletal muscle contraction
			B)	the presence of valves in veins
			C)	respiratory movements
			D)	All influence venous return
29		When occurring in the rectum, varicose veins are referred to as ____________.
			A)	plaque
			B)	embolus
			C)	hemorrhoids
			D)	phlebitis
30		This biotechnology drug converts plasminogen into plasmin which dissolves blood clots.
			A)	t-PA
			B)	p-TA
			C)	a-TP
			D)	t-AP
31		Instead of coronary bypass, _________ has been used since 1997 to grow new blood vessels.
			A)	angioplasty
			B)	wrapping the heart in a fabric sheath
			C)	coronary cultivation
			D)	gene therapy