Cardiac Function Quiz

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Chelsea Flynn

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Cardiac Function Quiz


Cardiac Function QuizOnline version quiz 8 review by Chelsea Flynn 1 Which substance acts as a potent vasoconstrictor and is part of a hormonal system regulating blood pressure? a Nitric Oxide b Bradykinin c Angiotensin II d Histamine 2 Active hyperemia refers to vasodilation caused by: a Cooling of the skin b Increased sympathetic nerve activity c Systemic release of Angiotensin II d Increased metabolic activity of the tissue (low O2, high CO2) e Decreased blood flow due to blockage 3 Stroke volume is defined as: a End-systolic volume minus end-diastolic volume b The pressure difference across the aortic valve c Cardiac output divided by heart rate d The volume of blood pumped out of the ventricle per beat e The total blood volume circulating in one minute 4 Which of the following phases is characterized by no change in ventricular volume but an increase in ventricular pressure? a Atrial systole b Rapid filling phase c Ventricular ejection d Isovolumetric contraction e Ventricular filling 5 What is the effect of sympathetic postganglionic neuron stimulation (releasing Norepinephrine) on most systemic arterioles? a Vasoconstriction via Alpha-1 adrenergic receptors b Hyperpolarization of smooth muscle c Vasodilation via Beta-2 receptors d No effect e Vasodilation via Muscarinic receptors 6 Which definition best describes end-systolic volume (ESV)? a The amount of blood left in the ventricle after ventricular contraction b The volume of blood that enters the ventricle from the vena cava c The maximum filling volume in the atria d The total amount of blood in both ventricles before they contract e The difference between end-diastolic volume and stroke volume 7 A researcher wants to assess changes in left ventricular pressure during isovolumetric contraction. Which valves should be confirmed to be closed to validate measurements during that phase? a Both AV valves and semilunar valves b No valves need to be closed c AV valves and semilunar valves d Semilunar valves only e AV valves only 8 You analyze a scenario where the first heart sound is split, indicating that one AV valve closes significantly before the other. What does this imply about the mechanical events of early systole? a Both semilunar valves are closing together prematurely b The diastolic filling phase overlaps with early systole c The aorta and pulmonary trunk have equal pressures d Ventricles eject blood independently e An asynchronous ventricular pressures causing valves to close at different times 9 If a patient has a blood pressure of 120/80 mmHg, what is their Mean Arterial Pressure (MAP)? a 85 mmHg b 120 mmHg c 110 mmHg d 100 mmHg e 93.3 mmHg 10 Which statement best explains how pressure differences cause blood to flow from the left atrium to the left ventricle? a The aortic pressure is the driving force for all ventricular filling b Blood flows due to higher atrial pressure compared to ventricular pressure during late diastole c Ventricular pressure is always higher than atrial pressure d The atrial walls contract at the same pressure as the ventricle to push blood e Atrial pressure is always higher than ventricular pressure during systole 11 Cardiac Output (CO) is the volume of blood pumped by the heart per minute. Which equation correctly defines it? a CO = Heart Rate × Stroke Volume b CO = End Diastolic Volume - End Systolic Volume c CO = Heart Rate + Stroke Volume d CO = Stroke Volume / Heart Rate e CO = Mean Arterial Pressure × Resistance 12 Arteries act as 'pressure reservoirs' due to which structural property? a Impermeable endothelial lining b Thin walls with minimal smooth muscle c High compliance and elastic recoil d Rigid calcified walls e One-way valves preventing backflow 13 Where are the high-pressure baroreceptors located? a In the Vena Cava and Pulmonary Veins b In the Carotid Sinus and Aortic Arch c In the Kidney arterioles d In the Left Ventricle myocardium e In the Hypothalamus 14 If blood pressure suddenly drops (e.g., standing up quickly), what is the immediate baroreceptor reflex response? a Decreased firing of baroreceptors -> Increased Sympathetic output b Increased firing of baroreceptors -> Increased Parasympathetic output c Increased firing -> Vasodilation d Decreased firing -> Decreased Heart Rate e No change in neural firing 15 During which specific phase do the atrioventricular (AV) valves and semilunar valves both remain closed while the ventricles relax? a Atrial systole b Isovolumetric ventricular contraction c Ventricular ejection d Isovolumetric ventricular relaxation e Ventricular filling 16 A researcher artificially elevates the afterload in an animal model and then measures the resulting changes in the cardiac cycle. What analytical statement explains why stroke volume may decrease? a Increased venous return offsets afterload elevation b Lower LVEDP results from the increased resistance c Ventricular filling increases in an afterload-driven scenario d Higher afterload reduces the total ejected volume e Heart rate must significantly decrease to compensate 17 Which of the following best defines systole? a The contraction phase of the ventricles b The period when the ventricles are completely relaxed c The phase of the cardiac cycle when the atria are passively filling d The time when blood is flowing through the AV valves into the ventricles e The phase when the semilunar valves open to allow passive filling 18 Why is Mean Arterial Pressure (MAP) a critical parameter for cardiovascular function? a It is always equal to systolic pressure b It represents the lowest pressure in the system c It indicates the stiffness of the veins d It is the average pressure driving blood flow to tissues/organs e It is solely determined by heart rate 19 Which of the following best defines end-diastolic volume (EDV)? a The volume of blood in the ventricle at the end of ventricular filling b The volume of blood in the ventricle at the end of systole c The amount of blood that flows through the aorta per minute d The volume ejected from the ventricle during systole e The residual volume left in the ventricle after ejection 20 A clinician is analyzing a patient's Wiggers diagram and sees that when left atrial pressure rises above left ventricular pressure, the mitral valve opens. Which phase is about to occur? a Isovolumetric relaxation b Ventricular ejection c Ventricular filling d Isovolumetric contraction e Atrial systole 21 Flow autoregulation via the 'myogenic response' implies that when arterial pressure increases and stretches the arteriole wall, the vessel will: a Release nitric oxide b Dilate to allow more flow c Constrict to maintain constant flow d Become rigid e Collapse completely 22 A patient has a significantly elevated left ventricular pressure that momentarily exceeds aortic pressure. Which event will most likely occur next? a Semilunar valves open to allow ejection b Ventricular filling begins c Stroke volume decreases d Isovolumetric relaxation starts e AV valves open fully 23 Which of the following best describes the effect of Norepinephrine (NE) on the heart's pacemaker potential? a It increases permeability to Na+ and Ca2+, speeding up depolarization b It decreases the slope of the pacemaker potential c It hyperpolarizes the membrane by opening potassium channels d It closes calcium channels to slow depolarization e It has no effect on the SA node, only on contractility 24 What is the primary mechanism by which Acetylcholine (ACh) decreases heart rate? a Opening sodium channels to depolarize the cell b Opening potassium channels to hyperpolarize the pacemaker cells c Blocking the AV node completely d Closing potassium channels to retain positive charge e Increasing calcium influx to strengthen contraction 25 How does the 'Respiratory Pump' increase venous return during inspiration? a By decreasing intrathoracic pressure (suction effect) and increasing abdominal pressure b By constricting the Vena Cava c By stopping blood flow to the lungs d By increasing intrathoracic pressure e By relaxing the diaphragm 26 A patient with a defective mitral valve has abnormal backflow from the ventricle into the atrium during systole. Which aspect of the cardiac cycle is directly affected? a Ventricular contraction phase b Isovolumetric relaxation c Semilunar valve closure d Diastolic filling e Late diastolic filling 27 What are the Sounds of Korotkoff? a Murmurs caused by septal defects b Electrical signals heard by the stethoscope c Sounds produced by turbulent blood flow during blood pressure measurement d Heart valve closure sounds (S1, S2) e Respiratory sounds transmitted to the chest wall 28 While assessing a patient, you measure an ejection fraction of 35%. Applying your knowledge of normal cardiac cycle function, which outcome is most directly influenced? a Diminished stroke volume relative to EDV b Prolonged atrial systole c Reduced end-diastolic volume d Longer isovolumetric contraction e Faster heart rate 29 Where is the integration center for the baroreceptor reflex located? a SA Node b Cerebral Cortex c Pituitary Gland d Medulla Oblongata e Spinal Cord 30 How does a high afterload (e.g., hypertension) initially affect Stroke Volume, assuming contractility is constant? a Stroke Volume increases to overcome the pressure b Stroke Volume decreases because the ventricle must generate more pressure to open the aortic valve c Ejection Fraction increases significantly d Stroke Volume remains exactly the same e End-Systolic Volume decreases 31 Which physiological parameter is NOT directly adjusted by the baroreceptor reflex to regulate Mean Arterial Pressure? a Blood Viscosity b Total Peripheral Resistance (Arteriolar radius) c Heart Rate d Stroke Volume (Contractility) e Venous tone 32 Which phase directly follows isovolumetric contraction in the cardiac cycle? a Ventricular relaxation b Ventricular ejection c Atrial contraction d Ventricular filling e Isovolumetric relaxation 33 Which mechanism aids venous return by compressing veins during muscle contraction? a Respiratory pump b Arterial recoil c Peristalsis d Capillary action e Skeletal muscle pump 34 What is the primary function of venous valves? a To produce heart sounds b To pump blood actively c To prevent backflow of blood away from the heart d To regulate oxygen exchange e To filter the blood 35 Heart sounds ('lub-dub') are primarily produced by: a The turbulence in the pulmonary trunk b The closing of the AV valves and semilunar valves c The atria contracting and relaxing d The rushing of blood through the ventricles e The vibration of the aorta during systole 36 A medical student studying heart murmurs encounters a patient whose murmur occurs during ventricular diastole. In applying knowledge of the cardiac cycle, which valvular defect might be the cause? a Aortic regurgitation b Aortic stenosis c Mitral valve prolapse during systole d Pulmonic stenosis e Mitral regurgitation 37 A patient exhibits a mid-systolic murmur accompanied by a gradual increase in left atrial pressure. Analyzing this scenario suggests which pathological condition? a Pulmonic stenosis affecting right ventricle b Aortic stenosis causing reduced outflow c Mitral stenosis raising atrial pressure in diastole d Mitral regurgitation increasing backflow during systole e Aortic regurgitation increasing afterload in diastole 38 Which of the following most accurately describes how valves ensure unidirectional blood flow in the heart? a AV valves open only when ventricular pressure is higher than atrial pressure b The chordae tendineae actively pull valves open c Semilunar valves open only when aortic pressure exceeds ventricular pressure d Valves rely solely on electrical impulses from the SA node to open e Valves open and close in response to changing pressure gradients across them 39 Which blood vessels are the primary sites of variable resistance in the systemic circulation? a Capillaries b Venules c Elastic arteries d Arterioles e Vena Cava 40 According to the Frank-Starling law of the heart, what is the primary effect of an increase in End-Diastolic Volume (preload)? a Increased Stroke Volume b Decreased Cardiac Output c Decreased force of contraction d Increased Heart Rate e Reduced stretch of cardiac muscle fibers 41 During a stress test, a patient's left ventricular pressure reaches normal systolic levels, but the stroke volume remains low. Which aspect of the cardiac cycle might account for these findings? a Shortened isovolumetric contraction b Excessively long atrial contraction c Prolonged relaxation phase in diastole d Increased afterload preventing adequate ejection e Early closure of AV valves leading to overfilling 42 When applying the concept of preload to optimize cardiac output, which factor would be most relevant to increase end-diastolic volume? a Enhance venous return and filling time b Accelerate isovolumetric relaxation c Shorten diastole d Decrease venous return e Increase afterload

Cardiac Function Quiz

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Cardiac Function QuizOnline version

by Chelsea Flynn

Which substance acts as a potent vasoconstrictor and is part of a hormonal system regulating blood pressure?

Active hyperemia refers to vasodilation caused by:

Stroke volume is defined as:

Which of the following phases is characterized by no change in ventricular volume but an increase in ventricular pressure?

What is the effect of sympathetic postganglionic neuron stimulation (releasing Norepinephrine) on most systemic arterioles?

Which definition best describes end-systolic volume (ESV)?

A researcher wants to assess changes in left ventricular pressure during isovolumetric contraction. Which valves should be confirmed to be closed to validate measurements during that phase?

You analyze a scenario where the first heart sound is split, indicating that one AV valve closes significantly before the other. What does this imply about the mechanical events of early systole?

If a patient has a blood pressure of 120/80 mmHg, what is their Mean Arterial Pressure (MAP)?

Which statement best explains how pressure differences cause blood to flow from the left atrium to the left ventricle?

Cardiac Output (CO) is the volume of blood pumped by the heart per minute. Which equation correctly defines it?

Arteries act as 'pressure reservoirs' due to which structural property?

Where are the high-pressure baroreceptors located?

If blood pressure suddenly drops (e.g., standing up quickly), what is the immediate baroreceptor reflex response?

During which specific phase do the atrioventricular (AV) valves and semilunar valves both remain closed while the ventricles relax?

A researcher artificially elevates the afterload in an animal model and then measures the resulting changes in the cardiac cycle. What analytical statement explains why stroke volume may decrease?

Which of the following best defines systole?

Why is Mean Arterial Pressure (MAP) a critical parameter for cardiovascular function?

Which of the following best defines end-diastolic volume (EDV)?

A clinician is analyzing a patient's Wiggers diagram and sees that when left atrial pressure rises above left ventricular pressure, the mitral valve opens. Which phase is about to occur?

Flow autoregulation via the 'myogenic response' implies that when arterial pressure increases and stretches the arteriole wall, the vessel will:

A patient has a significantly elevated left ventricular pressure that momentarily exceeds aortic pressure. Which event will most likely occur next?

Which of the following best describes the effect of Norepinephrine (NE) on the heart's pacemaker potential?

What is the primary mechanism by which Acetylcholine (ACh) decreases heart rate?

How does the 'Respiratory Pump' increase venous return during inspiration?

A patient with a defective mitral valve has abnormal backflow from the ventricle into the atrium during systole. Which aspect of the cardiac cycle is directly affected?

What are the Sounds of Korotkoff?

While assessing a patient, you measure an ejection fraction of 35%. Applying your knowledge of normal cardiac cycle function, which outcome is most directly influenced?

Where is the integration center for the baroreceptor reflex located?

How does a high afterload (e.g., hypertension) initially affect Stroke Volume, assuming contractility is constant?

Which physiological parameter is NOT directly adjusted by the baroreceptor reflex to regulate Mean Arterial Pressure?

Which phase directly follows isovolumetric contraction in the cardiac cycle?

Which mechanism aids venous return by compressing veins during muscle contraction?

What is the primary function of venous valves?

Heart sounds ('lub-dub') are primarily produced by:

A medical student studying heart murmurs encounters a patient whose murmur occurs during ventricular diastole. In applying knowledge of the cardiac cycle, which valvular defect might be the cause?

A patient exhibits a mid-systolic murmur accompanied by a gradual increase in left atrial pressure. Analyzing this scenario suggests which pathological condition?

Which of the following most accurately describes how valves ensure unidirectional blood flow in the heart?

Which blood vessels are the primary sites of variable resistance in the systemic circulation?

According to the Frank-Starling law of the heart, what is the primary effect of an increase in End-Diastolic Volume (preload)?

During a stress test, a patient's left ventricular pressure reaches normal systolic levels, but the stroke volume remains low. Which aspect of the cardiac cycle might account for these findings?

When applying the concept of preload to optimize cardiac output, which factor would be most relevant to increase end-diastolic volume?