During which phase of the cardiac cycle are the semilunar valves open? Select one: a. atrial filling b. atrial systole c. ventricular systole d. open in 2 out of 3 phases e. ventricular filling

The QRS wave of an ECG (or EKG) represents: a. depolarization of the ventricles. b. Depolarization and repolarization of the ventricles. c. Depolarization of the atria and ventricles. d. depolarization of the atria.

The only area of the heart that receives innervation from the brain is called the: A. Atrioventricular bundle B. Atrioventricular node C. Sinoatrial node D. Interatrial Fiber

Which is not true about our heart A. ventricular systole squeezes blood to the lungs and the body B. Both ventricles hold the same volume of blood C. The pacemaker is in the right atrium D. blood from the left lung goes to the left atrium and blood from the right lung goes to the right atrium

Based on the entry of the probe into the chambers of the heart, which heart vessel is the probe been inserted in?     A. Aorta   B. Superior vena cava   C. One of pulmonary veins   D. Pulmonary trunk

In the aorta, Select one: a. the resistance to blood flow is high, but velocity of blood flow is low. b. the velocity of blood flow is high, but blood pressure is low. c. velocity is diminished because the total cross-sectional area is small. d. the blood pressure and blood velocity are both high. e. the resistance to blood flow and the blood pressure are both low.

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

which of the following is TRUE for a cardiac cycle?    a. it only includes pressure changes that occur during one heart beat  b. it refers to volume changes that occur in one heart beat  c. it includes mechanical events during one complete heart beat  d. it refers to electrical activity of the heart during one complete heart beat

On an ECG, if every other P wave (e.g., every even is, and every odd is not) is NOT followed by the QRS complex, this is:    A. first degree AV block  B. second degree AV block  C. third degree AV block  D. atrial fibrillation