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EXPH 386 EXAM 4 QUESTIONS & ANSWERS VERIFIED 100% CORRECT!!
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EXPH 386 EXAM 4 QUESTIONS & ANSWERS VERIFIED 100% CORRECT!!
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EXPH 386 EXAM 4 QUESTIONS & ANSWERS VERIFIED 100% CORRECT!! EXPH 386Evatee 7/2/24 EXPH 386 EXPH 386 EXAM 4 QUESTIONS & ANSWERS VERIFIED 100% CORRECT!!
Five important functions of the cardiovascular system: Answer - 1) delivers *oxygen* to active tissues
2) returns *deoxygenated blood* to the lungs
3) transports *heat*, a by-product of cellular metabolism, from the body's core
to the skin
4) delivers *fuel, nutrients* to active tissues
5) transports *hormones*, the bodys chemical messengers for regulation
is the heart a dual pump? Answer - yes
between the heart and the lungs is the Answer - pulmonary circulation
between the heart and other body systems Answer - systemic circulation
Systemic circulation is the portion of the CV which carries ____________ blood back away from the heart, to the ________, and returns _____________ blood back to the heart Answer - oxygenated
body
deoxygenated Pulmonary circulation is the portion of the CV which carries _________ blood away from the heart, to the ___________, and returns _________ blood back from the heart Answer - deoxygenated
lungs
oxygenated
the hearts only function is to Answer - pump blood
higher blood pressure = Answer - higher ventricular mass (larger ventricles)
Tricuspid and Mitral valve snap shut and P + A open Answer - LUB sound (1st heart sound)
P + A snap chut and Tricuspid and Mitral valve open Answer - Dub sound (2nd heart sound)
what pumps blood to whole body Answer - left side
what pumps blood to lungs Answer - right side
Blood flows through the heart in one direction: Answer - from veins, to atria, to ventricles, to arteries
ventricles goverened by pressure gradients Answer - passive filling
atrial contraction Answer - active filling at resting heart rates, the atrial contraction only contributes ______% to the filling of the ventricle Answer - 30%
Approximately ________ of the *venous return* (blood returning to the heart) enters the ventricles before the atria undergo contraction Answer - 70%
For *isovolumetric contraction*, for a brief period of time (__________), when all heart valves remain shut, ventricular pressure __________ but volume and fiber length remains unchanged Answer - (0.02 to 0.06)
increases (rises)
For *isovolumetric relaxation*, for a brief period of time (__________), when all heart values remain shut, ventricular pressure __________ but volume and fiber length remains unchanged Answer - (0.02 to 0.06)
decreases (drops)
what can cope with high pressure since they are so thick? Answer - arteries
thick walled, high pressure tubing that conducts *oxygenated* blood
-has smooth muscle cells and endothelial cells Answer - arteries
-smaller branched arteries, circular layers of connective tissue
- constrict or relax changing the resistance to blood flow Answer - arterioles
arterioles is also known as` Answer - resistance vessels
*single* layer of *endothelial cells* line wall
-NO smooth muscle
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