The cardiac conduction system includes all of the following except:- a. the SA node. b. the AV node. c. the bundle branches. d. the tendinous cords. e. the Purkinje fibers

a. Only between cardiac cycles b. Ventricular diastole c. Ventricular systole d. Throughout the cardiac cycle

How would the left ventricle of a patient who had had high blood pressure for many years differ from the left ventricle of a normal heart?   A it would have a larger volume of muscle   B it would have a smaller volume of muscle   C it would be smaller than the right ventricle   D chronic high blood pressure would weaken the heart valves but would have no anatomical effects on the walls of the ventricles

All of the following are correct about the isovolumetric contraction, except  ____________.         A. This phase of the cardiac cycle begins with the appearance of the QRS complex of the ECG, which represents atrial repolarization and ventricular depolarization   B. It represents the time period between the closure of the AV valves and the opening of the aortic and pulmonic valves, ventricular pressure rises rapidly without a change in ventricular volume   C. The rate of pressure increase in the ventricles is determined by the rate of contraction of the muscle fibers, which is determine by mechanisms governing excitation-contraction coupling   D. Ventricular chamber geometry changes considerably as the heart becomes more spheroid in shape; circumference increases and atrial base-to-apex length increases