Below is a quiz on the very basics of heart physiology. Best of luck!
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The Heart as an Electrical Pump
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The function of an intercalated disc ...
Is to store myofibrils
Is the anchor point of the Z line
Permits rapid propagation of ions between cells
Is a unit of the sarcomere
A sarcomere lies between
The attachment points of myosin
The attachment points of actin
The thick filament
The thin filament
A patient has a positive deflection in the septal electrodes of the 12-lead ECG. Which of the following modified cells had a depolarised membrane?
SA nodal cells
AV nodal cells
Subendocardial interventricular cells
The second phase of the cardiac action potential is best defined as
The point at which voltage gated sodium channels open
The point at which voltage gated sodium channels close
The point at which voltage gated potassium channels open slowly
The point at which voltage gated potassium and calcium channels are patent
Of the relative refractory period
Slow Ca++ channels are occluded
K+ channels are patent
It comes before the absolute refractory peroid
This is a composite of depolarisation
Tetany of cardiomyocytes is prevented by
Longevity of the refractory period
Speed of depolarisation
Plateau phase of repolaristaion
Increased volume of intracellular mitochondria
Which of the following statements is untrue in relation to calcium-induced calcium release (CICR)?
Dihydropyridine channel lies on the T tubular sarcolemma
The sarcoplasmic reticulum contains Ryanodine receptors
Intracellular calcium cations bind tropomyosin
The action potential propagates along the T tubule
Post-mortem chemical changes in a corpse is due to loss of ATPase functionality from which peptide?
The dicrotic wave correlates to which auscultated sound?
Question 9 Explanation:
The dicrotic notch is heard in iso-volumetric ventricular relaxation as the aortic (semilunar) valve snaps shut and causes turbulence of back flow of blood about its cusps. This is the second heart sound (S2)
Intraventricular pressure between the R-S interval of the ECG
Question 10 Explanation:
The R-S interval of the QRS complex correlates to the period of isovolumetric contracture. Under Boyles' law (P/V), as contracture occurs and ventricular space decreases, the pressure will exponentially increase - the "iso" volumetric state is referring to the fact that there is no change in volume of the blood, not of space of the ventricle.
The compensation of a calcified aortic valve is
Right ventricular hypertrophy
Right ventricular dilatation
Left ventricular hypertrophy
Stem 1 of 3
A patient presents short of breath, coughing frothy pink-hewed sputum and complains of orthopnea. His medical history is notable for three instances of MI, cardiogenic shock and HFpEF diagnosed 2 years previously.On auscultation a click is noted after the SL valves close. What is this termed?
Stem 2 of 3What does this sound denote?
Stasis of vessels
Hypertrophy of the ventricular myocardium
Secondary to another MI
Stem 3 of 3Closure of the semilunar valves occurs ordinarily in...
Only atrial diastole
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There are 14 questions to complete.