Mastering A And P- Heart And ECGs Reading Quiz

All EXCEPT which of the following are characteristics of cardiac muscle tissue? a) Gap junctions are present. b) Cardiac muscle has neurogenic contractile ability. c) Cardiac action potentials are relatively long lasting. d) Cardiac muscle has myogenic contractile ability.

Which of the following is NOT true about the functions of the cardiovascular system? a) The blood vessels are also sensory and effector organs. b) Blood carries oxygen and nutrients to tissues and removes wastes. c) The regulation of the cardiovascular system does not depend on interactions with any other organ or systems. d) The heart pumps blood through blood vessels to various organs and systems.

Which of the following components of blood contains hemoglobin?

The right ventricle of the heart pumps ______________blood into the______________.

Which of the following refers to the middle layer of cardiac muscle?

During the initial period of pacemaker potential from spontaneous depolarization to subthreshold, which channels are open?

Which of the following components of the electrocardiogram (ECG) is an upward deflection caused by ventricular repolarization and is correlated with phase 3 of the ventricular contractile cell action potential?

At the beginning of systole, when ventricular pressure exceeds atrial pressure, the AV valves close and the semilunar valves also remain closed because the pressure within the ventricles is still not sufficiently strong to force them open. At this point there is no flow of blood in or out of the ventricles. This phase is known as ___________.

The volume of blood ejected from the heart during one beat is known as ________.

If an increase in end-diastolic volume (EDV) occurs, the force of ventricular contraction rises. This will produce an increase in which of the following?

Conduction through which of the following is slow to allow atria to contract before the ventricles?