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OSSF 2 – Questions & Accurate Answers (Guaranteed Pass!)
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OSSF 2 – Questions & Accurate Answers (Guaranteed Pass!)
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OSSF 2 – Questions & Accurate Answers (GuaranteedPass!)
What aspect of the cardiovascular system does the kidney control? Right
Ans - Blood volume
What is the purpose of the valves in both the heart and veins? Right Ans -
Unidirectional flow
What circulation does the right side of the heart pump to? Right Ans -
Pulmonary
What circulation does the left side of the heart pump to? Right Ans -
Systemic
Where are the exceptions to the '1 set of capillaries' rule? Right Ans - Liver,
kidney, anterior pituitary
As cross-sectional area of blood vessels increases, velocity ____ Right Ans -
decreases
Arteries have more of what fibers compared to arterioles? Right Ans -
Elastic
Arterioles have more _____ than arteries Right Ans - Smooth muscle
What blood vessels serve as the major site of regulation in the cardiovascular
system? Right Ans - Arterioles
What are the two important shunts in the fetus? Right Ans - Foramen ovale,
ductus arteriosus
Where does the foramen ovale direct blood? Right Ans - From the R atrium
to the L atrium
Where does the ductus arteriosus direct blood? Right Ans - From the
pulmonary artery to the aorta
,how does blood get to the fetus? Right Ans - Umbilical vein
Do blood vessels in the fetus supply the liver? Right Ans - No
True/false: in the coronary circulation, each cardiac myocyte has a single
corresponding capillary Right Ans - False: each myocyte has several
capillaries
Where do the coronary veins drain into? Right Ans - Coronary sinus
Why does the coronary blood flow decrease during systole? Right Ans -
Coronary arteries are compressed
True/false: coronary perfusion increases during exercise Right Ans - False:
when HR increases, length of diastole decreases, decreasing coronary
perfusion
What is the function of endocardium? Right Ans - Impulse conduction
What is the function of myocardium? Right Ans - Contraction
What is the function of epicardium? Right Ans - Homeostasis
What are the components of pericardium? Right Ans - Fibrous tissue,
adipose, mesothelium
What part of the heart valves are vascular? Right Ans - Base
What is the structure of the heart valves? Right Ans - Connective tissue
sandwich surrounded by endothelium
What is the name of the fibrous rings that are where the valve leaflets
originate? Right Ans - Annuli fibrosi
What is the name of the structures that join the annuli fibrosi? Right Ans -
Trigona fibrosa
What is the name of the separation between the ventricles and atria? Right
Ans - Membranous septum
, True/false: the heart needs a stimulus in order to beat Right Ans - False
What kind of cells make up the SA node? Right Ans - Modified cardiac
myocytes
How are the cells of the SA node different from cardiac myocytes? Right
Ans - Few myofibers, no intercalated discs
What are the characteristics of the purkinje fibers? Right Ans - Few
myofilaments, lots of glycogen, conducts impulses much faster than muscle
cells
What are the layers of vessels, from outside to inside? Right Ans - Tunica
adventitia, tunica media, tunica intima
What are the components of the tunica intima? Right Ans - Endothelium
and basement membrane, connective tissue, may or may not have internal
elastic lamina
What is the function of the tunica intima? Right Ans - Regulate permeability
What are the components of the tunica media? Right Ans - Smooth muscle,
external elastic lamina
What is the function of the tunica media? Right Ans - Regulation of vessel
compliance - by number of elastic fibers and contractile state of smooth
muscle
What are the components of the tunica adventitia? Right Ans - Connective
tissue, adipose
What is the function of the tunica adventitia? Right Ans - Neuronal
regulation of vessel wall
What is an example of a muscular artery? Right Ans - Coronary arteries
Are the internal and external elastic laminae visible in elastic arteries?
Right Ans - They are indistinct
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