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WorksheetsHeart
Total questions: 15
Worksheet time: 9mins
Which of the following is not a function of the pericardium
Protect and anchor the heart
Allows the heart to work in a friction-free environment
Maintain a reservoir of blood so that the heart can perfuse itself during diastole
Prevent overfilling of the heart with blood
Where do the coronary arteries originate from?
Left ventricle
Aortic arch
Ascending aorta
Descending aorta
When are the coronary arteries filled with blood?
Ventricular Systole
Ventricular Diastole
They maintain constant flow, as they receive pressure from the contraction of both atria and ventricles
When the ventricles contract
Branches of the coronary veins converge at the
Coronary sinus
Inferior vena cava
Superior vena cava
Right atrium
Between the p wave and the q wave one should see a lack of deflection, indicating an isoelectric current that is moving neither towards nor away from the lead. Why is this?
Following atrial contraction and before ventricular contraction, there is a period of isovolumetric contraction
Skeletal fibers have greater electrical resistance, which slows down the current as it passes from the right atrium to the septum
The AV node delays the electrical impulse by ~0.1 sec so that blood has time to enter the ventricles
Without this period of isoelectric mediation by the vagus nerve, the SA node would speed up its rate of impulse generatiom
The T wave represents
Ventricular repolarization
Ventricular depolarization
Atrial depolarization
Atrial repolarization
Fall in ventricular pressure causes what first
Blood from atria to rush in
AV valves to open
Semilumar valves to shut
Atria fill with blood
Forcefulness of contraction of individual ventricular muscle fibers
Preload
Afterload
Cardiac output
Contractility
Which of the following does not affect stroke volume
Preload
Afterload
Cardiac Reserve
Contractility
An average person may have this at 4-5x their resting value, while one suffering from severe heart disease may not have this at all
Cardiac Reserve
Exertional Output
Contractility
End Diastolic Volume
Which of the following is an example of a negative inatropic agent
ACE Inhibitors
Calcium channel blockers
Loop diuretics
Amiodarone
This neurotransmitter/hormone, binding to this receptor, causes an increase in contractility
Norepinephrine, B1
Norepinephrine, B2
Epinephrine, A1
Epinephrine, B2
Stimulation of this nerve releases acetylcholine to oppose the sympathetic nervous system and mediate the impulses fired by the SA node
Phrenic
Vagus
Hypoglossal
Glossopharyngeal
Which of the following is a negative chronotrope
Epinephrine
Thyroid hormone
Potassium chloride
Calcium chloride
Which of the following is most unlikely to cause an increase in afterload and decreased stroke volume
Atherosclerosis
Symptomatic Bacteremia
Systemic hypertension
Valve stenosis
