WorksheetsMARCH 2020 CVS : Dr Libranda
Total questions: 10
Worksheet time: 7mins
True of Frank Starling’s principle
As the ventricular volume increases during diastole, the resulting systolic pressure also increases at a certain point, above which no increase in pressure would be anticipated
As the ventricular volume increases during diastole, the resulting systolic pressure decreases at a certain point, above which no increase in pressure would be anticipated
A direct linear relationship between ventricular volume and systolic pressure
An inverse relationship between ventricular volume and systolic pressure
2. True of cardiac muscles
Function as a syncytium
Absence of T tubules
Fatigues slowly
Innervated by motor end plate
True of electrolyte(s) in terms of cardiac functions
Resting membrane potential is independent on extracellular Na
Resting membrane potential is dependent on extracellular Na
Resting membrane potential is dependent on extracellular K
Both A and C
True of excitation contraction coupling sequence
AP -> Ca enters the cell via the Ca channels (L type) -> release Ca from the SR via the ryanodine receptors -> Ca binds to troponin C which then forms a complex -> contraction of myofibrils
AP -> Ca enters the cell via the Ca channels (T type) -> release Ca from the SR via the ryanodine receptors -> Ca binds to troponin C which then forms a complex -> contraction of myofibrils
AP -> Ca enters the cell via the Ca channels (L type) -> release Ca from the SR via the ryanodine receptors -> Ca binds to troponin I which then forms a complex -> contraction of myofibrils
AP -> Ca enters the cell via the Ca channels (T type) -> release Ca from the SR via the ryanodine receptors -> Ca binds to troponin I which then forms a complex -> contraction of myofibrils
Identify the following from the graph: Isovolumic contraction
A – C
C – D
D – F
F – A
Identify the following from the graph: Isovolumic Relaxation
A - C
C - D
D - F
F - A
Which is correctly paired
First heart sound : closure of the AV valve
Second heart sound : closure of the AV valve
Third heart sound : pathologic in children
Fourth heart sound : can be heard in normal individuals
Which is correctly paired
Tricuspid valve sound : 5th ICS LPSB
Mitral valve sound : 5th ICS LPSB
Aortic valve sound : 3rd ICS RPSB
Pulmonic valve sound : 3rd ICS LPSB
True of preload
Force that stretches the relaxed muscle fibers
Increased by greater filling of the L ventricle during systole
Affected by venous return
Both A and C
True of afterload
Force against which the contracting cardiac muscles acts
Affected by the total peripheral resistance
Increased in patients with chronically constricted resistance vessels
All of the above
