Public HealthMedicineHeart example #67934
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Heart

Jax Wilson avatar Jax Wilson
25 July 2022
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21 test answers

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question
Select all that are coronary veins or any structure associated with coronary veins. Check All That Apply Jugular vein Great cardiac vein Coronary sinus Middle cardiac vein
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Great cardiac vein Coronary sinus Middle cardiac vein
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Cell-to-cell junctions, called intercalated discs, contain distinct structural features called gap junctions and Multiple Choice T-tubules. desmosomes. myofilaments. branching.
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desmosomes.
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Identify whether each item would increase or decrease stroke volume: - Increasing preload - Sympathetic stimulation - Stress - Increased heart rate - Dehydration - Increasing contractility - Increasing afterload - Increasing EDV - Acute exercise - Decreasing venous return
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Increase SV: - Increasing preload - Stress - Increased HR - Increasing contractility - Increasing EDV - Acute exercise Decrease SV: - Sympathetic stimulation - Dehydration - Increasing afterload - Decreasing venous return
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Complete each sentence by dragging the labels to the appropriate blanks. Then place each sentence in a logical order beginning with the SA node in a resting state. Not all terms will be used.
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Unlike the membrane of neurons and skeletal muscle, resting potential of the SA node drifts upward due to a steady leak of sodium into the cell. Moving from -60 mV to a threshold of -40 mV, voltage-regulated fast calcium and sodium channels open. The rapid movement of sodium and calcium into the cell causes the depolarizing event of the action potential. Then, as in skeletal muscle and neurons, voltage-regulated potassium channels open and allow potassium to rush out of the cell. The movement of potassium to the ECF repolarizes the membrane and returns the SA node cells to -60 mV.
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True or false: during the refractory period of cardiac muscle, the cell is likely to generate another action potential.
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false
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true or false: the plateau phase of the action potential in cardiac muscle delays repolarization to the resting membrane potential; therefore the refractory period is prolonged
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true
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Oxygen-poor blood enters which chamber of the heart? Multiple Choice Left atrium Right atrium Left ventricle Right ventricle
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right atrium
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The right atrioventricular valve is also called the Multiple Choice left atrioventricular valve. bicuspid valve. tricuspid valve. mitral valve.
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tricuspid valve
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The only arteries in the body that carry oxygen-poor blood are the coronary arteries. True or false
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false
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Left ventricular contraction propels blood through which valve? Multiple Choice Left atrioventricular (bicuspid) valve Right atrioventricular (mitral) valve Aortic valve Pulmonary valve
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aortic valve
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What are the primary variables influencing stroke volume (SV)? Check all that apply. Check All That Apply Chronotropic agents Afterload Venous return or preload Contractility or inotropic agents
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Afterload Venous return or preload Contractility or inotropic agents
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The semilunar valves remain open throughout the ____________________ phase of the cardiac cycle.
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late ventricular systole
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The atria remain in diastole throughout both the _______________________ phases of the cardiac cycle. ventricular systole and ventricular diastole early and late ventricular systole early and late ventricular diastole
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ventricular systole and ventricular diastole
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1. Positive inotropes allow the heart to pump ____________ blood with fewer heart beats. They do this by _____________________ the end-systolic volume (ESV). more; increasing less; increasing less; decreasing more; decreasing
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more; decreasing
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An individual with high blood pressure (hypertension) is expected to benefit from the administration of ____________________ inotropic drugs that _______________ the hearts workload. negative; decrease positive; increase negative; increase positive; decrease
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negative; decrease
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The expected effect of the drug Digoxin is to _________________ ventricular contraction and _________________ stroke volume. weaken; increase strengthen; increase strengthen; decrease weaken; decrease
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strengthen; increase
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Coronary arteries are _____ when all four heart chambers are relaxed. Multiple Choice compressed patent (open)
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open
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Select all that are true regarding ventricular balance. Check All That Apply The right ventricle has to pump blood farther than the left. The left ventricle is larger and stronger than the right. . The left ventricle contracts more times per minute as compared to the right. If stroke volume is not the same in each ventricle, edema may result.
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If stroke volume is not the same in each ventricle, edema may result. The left ventricle is larger and stronger than the right.
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The AV valves close in response to the ________________________. contraction of the ventricles and the resulting drop in ventricular pressure contraction of the ventricles and the resulting rise in ventricular pressure contraction of the atria and the resulting rise in atrial pressure contraction of the atria and the resulting drop in atrial pressure
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contraction of the ventricles and the resulting rise in ventricular pressure
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Action potentials received directly from ________________ stimulate the papillary muscles to contract, allowing for the proper _______________ of the AV valves. AV node; opening Purkinje fibers; closing AV node; closing Purkinje fibers; opening
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Purkinje fibers; closing
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Mitral valve prolapse severe enough to cause regurgitation may directly cause _________________ pressure in the ____________ atrium. increased; right increased; left decreased; right decreased; left
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increased; left