NEW
Font size
WorksheetsCardiac Anatomy and Physiology
Total questions: 10
Worksheet time: 6mins
1. “Within limits, the greater the initial length of the fiber, the stronger will be the force of its contraction; However, overstretching the fiber as in heart failure its power of contractility decreases’ within limits, the power of contraction is directly proportional to the initial length of the muscle.”
Boyle’s Law
Starling’s Law
Charles’ Law
Avogadro’s Law
Which is false regarding the contractility of the heart?
Presence of the anatomical syncytium
Presence of the functional syncytium
Property of the heart as a pump
Presence of the actin and myosin filaments
Which is true regarding conduction velocities?
The AV node has the slowest conduction velocity because it has fewer intercalated discs
The SA node has the slowest conduction velocity because this is important in allowing sufficient time for the ventricles to be filled with blood
The Purkinje fibers have the slowest conduction velocity to allow the two atrias to contract at the same time
The Purkinje fibers have the fastest conduction velocity to allow the two atrias to contract at the same time
Which correctly states the conductivity property of the heart?
It is the ability of cardiac muscle to conduct the cardiac impulses that are initiated in the AV node
During atrial spread of impulse from AV node, impulse travels to conductive tissues, then to ventricles
During the ventricular spread of impulse from apex of the heart, impulse travels to the base of the heart via Purkinje fibers to the endocardial surface of ventricles
The conduction of the impulse starts at RV being more thicker followed by the LV, thus the ventricles will contract at the same time
Which is FALSE regarding the phases of action potential of ventricular muscle:
Phase 0 = Rapid depolarization
Phase 1 = Rapid repolarization
Phase 3 = Slow repolarization
Phase 4 = Complete depolarization
Most important determinant of coronary blood flow:
Cardiac Output
Stroke Volume
Myocardial oxygen consumption
Systemic Vascular Resistance
Fundamental contractile unit of cardiac muscle:
Actin
Tropomyosin
Myosin
Sarcomere
Primary determinant of myocardial oxygen consumption in the intact heart:
Cardiac Output
Stroke Volume
Heart Rate
Systemic Vascular Resistance
The primary cardiac pacemaker
SA Node
AV Node
Bundle of His
Thorel pathways
True about the Electrical-Pump Coupling Diagram:
Atrial contraction causes increased atrial and ventricular pressure
Mitral valve closes, which is equivalent to the first heart sound
Aortic valve opens when aortic pressure equals LV pressure
Aortic valve closes, which is equivalent to the second heart sound
All of the above
