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 important function(s) can be attributed to capillaries?
			A)	exchange of substances takes place across capillary walls
			B)	capillaries help maintain the constancy of tissue fluid
			C)	capillaries regulate blood pressure
			D)	both A and B are correct
			E)	All of these are correct.
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 ______ act(s) 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)	villi
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 dub 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		The thoracic duct return lymph into the left __________ vein.
			A)	lymphatic
			B)	subclavian
			C)	vena cava
			D)	pulmonary
23		Localized swelling caused by accumulation of tissue fluid is called a(n) ______.
			A)	edema
			B)	aneurysm
			C)	inflammation response
			D)	node
24		Each nodule of a lymph node contains a sinus filled with __________.
			A)	lymphocytes
			B)	macrophages
			C)	both A and B
25		The spleen's purpose is to __________.
			A)	filter lymph of impurities
			B)	filter blood of impurities
			C)	both A and B
26		A spleen nodule contains __________.
			A)	red pulp with blood cells and macrophages
			B)	white pulp with lymphocytes
			C)	both A and B