Bio 669 Quiz 4 Questions with Correct Answers 100% Verified and Graded A+
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Course
Bio 669
Institution
Bio 669
Bio 669 Quiz 4 Questions with Correct Answers 100% Verified and Graded A+
What is the circulation of the right heart? - Correct Answer pulmonary circulation-blood through lungs
what is the circulation of the left heart? - Correct Answer systemic circulation- blood through body
what are the t...
Bio 669 Quiz 4 Questions with Correct Answers
100% Verified and Graded A+
What is the circulation of the right heart? - Correct Answer pulmonary circulation-blood
through lungs
what is the circulation of the left heart? - Correct Answer systemic circulation- blood
through body
what are the three layers in the pericardium? - Correct Answer epicardium
myocardium
endocardium
What is the epicardium? - Correct Answer outer layer of the heart
What is the myocardium? - Correct Answer cardiac muscle
What is the endocardium? - Correct Answer inner lining of the heart
what are the four chambers of the heart? - Correct Answer right atrium, right ventricle,
left atrium, left ventricle
What are the atrioventricular valves? - Correct Answer tricuspid and bicuspid valves
What valves have chordae tendinae? - Correct Answer tricuspid and bicuspid (Mitral
valve)
what valves are open for ventricular diastole or relaxation? - Correct Answer the
atrioventricular valves -tricuspid and bicuspid valves
what does ventricular diastole allow? - Correct Answer allows blood to flow from the
atria into the ventricles
what valves are open for ventricular systole? - Correct Answer the semilunar valves-
pulmonary and aortic
what causes ventricular systole? - Correct Answer the 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 Answer pulmonary and aortic
,what valves are on the left side of the heart? - Correct Answer mitral valve and aortic
semilunar valve
what valves are on the right side of the heart? - Correct Answer Tricuspid valve and the
pulmonic semilunar valve
What are the great vessels? - Correct Answer Superior and inferior vena cava; Right
and left pulmonary arteries; Pulmonary veins; Aorta
what are the phases of the cardiac cycle? - Correct Answer -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 Answer nearly identical to skeletal muscle cells
but are important for cardiac function
What is preload? - Correct Answer amount 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 Answer Basically, 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 Answer force that is needed for the ventricles to overcome
the pressure on the other side of the semilunar valves (arteries).
What is stroke volume? - Correct Answer the amount of blood able to be forced out.
what does myocardial contractility increase based on? - Correct Answer increased
preload= increased stroke volume
What do inotropic agents do? - Correct Answer increase contractility= increase stroke
volume (more blood out)
, What is cardiac output? - Correct Answer volume of blood flowing through the systemic
or pulmonary circuit in liters per minute
stroke volume and the HR
What is ejection fraction? - Correct Answer stroke volume (amount of blood able to be
forced out) /end diastolic volume (amount of blood able to fill ventricle)
What are coronary arteries? - Correct Answer left and right coronary arteries
What are the components of the right coronary artery? - Correct Answer conous, right
marginal, posterior descending
what are the components of the left coronary artery? - Correct Answer left anterior
descending, circumflex artery
what are collateral arteries? - Correct Answer Connections (or anastomoses) between 2
branches of the same or the opposite coronary artery.
allows for blockages to occur and still have sufficient blood flow.
can still result in angina for activities that require more blood flow
What are the coronary veins? - Correct Answer 1. Coronary sinus=combination of the
great cardiac vein, middle cardiac vein, and the small cardiac vein= drains into the right
atrium
2. Great cardiac vein.
3. Posterior vein of the left ventricle.
What are lymphatic vessels? - Correct Answer collect lymphatic fluid from the heart then
empties into the superior vena cava
what are the components of the hearts conduction system? - Correct Answer Sinoatrial
(SA) node
atrioventricular (AV) node
bundle of his (AV branches)
Right and Left bundle branches
purkinje fibers
What does acetylcholine do for resting membrane potential of the heart? - Correct
Answer slows the leakiness and the HR
what do catecholamines (Epinephrine and norepinephrine) do for resting membrane
potential of the heart? - Correct Answer increase leakiness and HR
Heart beat stronger and eject more blood per beat because increase in calcium in the
myocytes.
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