Which of the following is NOT a population of pacemaker cells in the heart? a. papillary muscles b. sinoatrial (SA) node c. atrioventricular (AV) node d. Purkinje fiber system

The heart is found within the: A. pleural cavity B. mediastinum C. peritoneal cavit

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

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

Which of the following is true of the EKG?   A. Depolarization of the atria cannot be seen on the EKG B. Repolarization of the atria cannot be seen on the EKG. C. Depolorization of the ventricles cannot be seen on the EKG. D. Repolorazition of the ventricles cannot be seen on the EKG.

What is the correct order of events in the left ventricle during the systole phase of the cardiac cycle?   a. Ventricular repolarization, ventricular relaxation, 2nd heart sound, AV valve opens, blood moves in b. QRS-complex, ventricular contraction, 2nd heart sound, aortic valve opens, blood moves out c. P-wave, increased ventricular pressure, 1st heart sound, aortic valve opens, blood moves in d. QRS complex, ventricular contraction, 1st heart sound, AV valve opens, blood moves out e. QRS complex, increased ventricular pressure, AV-valve closes, blood moves out

The blood vessels responsible for variably distributing cardiac output among organs in the body are: a. Veins b. Arteries c. Capillaries  d. Arterioles

a calcium channel blocker or an antagonist drug will produce a. vasoconstriction b. increase in blood pressure c. increase in total peripheral resistance d. reduction in cardiac muscle contractility