Bio 669 Quiz 4 exam 2024/2025 with 100% correct answers
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Course
Bio 669 hy
Institution
Bio 669 Hy
What is the circulation of the right heart? correct answerspulmonary circulation-blood through lungs
what is the circulation of the left heart? correct answerssystemic circulation- blood through body
what are the three layers in the pericardium? correct answersepicardium
myocardium
endocard...
What is the circulation of the right heart? correct answerspulmonary circulation-blood through lungs
what is the circulation of the left heart? correct answerssystemic circulation- blood through body
what are the three layers in the pericardium? correct answersepicardium
myocardium
endocardium
What is the epicardium? correct answersouter layer of the heart
What is the myocardium? correct answerscardiac muscle
What is the endocardium? correct answersinner lining of the heart
what are the four chambers of the heart? correct answersright atrium, right ventricle, left atrium, left
ventricle
What are the atrioventricular valves? correct answerstricuspid and bicuspid valves
What valves have chordae tendinae? correct answerstricuspid and bicuspid (Mitral valve)
what valves are open for ventricular diastole or relaxation? correct answersthe atrioventricular valves -
tricuspid and bicuspid valves
what does ventricular diastole allow? correct answersallows blood to flow from the atria into the
ventricles
,what valves are open for ventricular systole? correct answersthe semilunar valves- pulmonary and aortic
what causes ventricular systole? correct answersthe increased pressure of the ventricles exceeds the
pressure in the atria , blood tried to go back into the atria and this closes the atrioventricular valves to
close, the closing of the atrioventricular valves increases the pressure of the ventricle even more,
exceeding the pressure of the major arteries and forces the semilunar valves open to allow blood to flow
from the ventricles to the major arteries.
What are the semilunar valves? correct answerspulmonary and aortic
what valves are on the left side of the heart? correct answersmitral valve and aortic semilunar valve
what valves are on the right side of the heart? correct answersTricuspid valve and the pulmonic
semilunar valve
What are the great vessels? correct answersSuperior and inferior vena cava; Right and left pulmonary
arteries; Pulmonary veins; Aorta
what are the phases of the cardiac cycle? correct answers-diastole: ventricular filling= pressure of atrial
exceeds the pressure of the ventricle= AV opens to fill the ventricle then close (S1) as the ventricular
pressure starts to exceed the atrial.
-Systole: isovolumetric contraction=volume stays the same but contraction is occurring=pressure is cont.
to rise.
-Systole: ventricular ejection= pressure of ventricles exceeds the pressure of the aorta= AV opens and
blood is ejected out of the ventricle and throughout the body= pressure of ventricle below the pressure
of the artery= Semilunar close (S2)
-Diastole: isovolumetric relaxation= pressure drops but volume stays the same.
What are myocardial cells? correct answersnearly identical to skeletal muscle cells
but are important for cardiac function
What is preload? correct answersamount of venous blood returning to the right atrium= increased
pressure= the more force of fill in the ventricle
, how much blood is in the ventricle at the end of relaxation (diastole)
What is the Frank-Starling law of the heart? correct answersBasically, the more blood returned to the
heart (the more EDV), the more blood will be ejected with each beat, this is based on the relationship of
the stretch of the sarcomeres and the ability of actin and myosin to form cross-bridges.
increase in preload= increase of ventricular filling= increase of blood pumped out.
What is afterload? correct answersforce that is needed for the ventricles to overcome the pressure on
the other side of the semilunar valves (arteries).
What is stroke volume? correct answersthe amount of blood able to be forced out.
what does myocardial contractility increase based on? correct answersincreased preload= increased
stroke volume
What do inotropic agents do? correct answersincrease contractility= increase stroke volume (more blood
out)
What is cardiac output? correct answersvolume of blood flowing through the systemic or pulmonary
circuit in liters per minute
stroke volume and the HR
What is ejection fraction? correct answersstroke volume (amount of blood able to be forced out) /end
diastolic volume (amount of blood able to fill ventricle)
What are coronary arteries? correct answersleft and right coronary arteries
What are the components of the right coronary artery? correct answersconous, right marginal, posterior
descending
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