EKG Continuous Review

What cells are considered the electrical power source of the heart? 

• Pacemaker Cells

• Power-making Cells

• Myocardial Cells

• Electrical Conducting Cells

What is considered normal blood pressure?

• Systolic >40 and diastolic >80

• Systolic <120 and Diastolic <80

• Systolic between 120-129 and Diastolic <80

• Systolic Between 130 and 139 and Diastolic between 80 and 89

What structure keeps the heart in a fixed space, surrounds the heart, and is attached to the diaphragm, great vessels, and sternum overlying the heart?

• Pericardium

• Epicardium

• Myocardium

• Endocardium

When the atrium takes over as the pacemaker of the heart, what is this action called?

• Arrest

• Usurpation

• Escape

• Fibrillation

Electrical waves are sent from the SA node to the AV node, where conduction slows. What is the reason for this pause in conduction?

• To send the conduction to the bundle of his more quickly

• to begin ventricular contraction before the atria finish contracting

• to allow time for the atria to contract before the ventricles contract

• To increase the heart rate

Which neurotransmitter causes increases in heart rate and blood pressure?

• Dopamine

• Norepinephrine

• Oxytocin

• Acetylcholine

During diastole, the atria slightly contract to squeeze the remaining amount of blood into the ventricles. What is this phase called?

• Atrial Kick

• Systole

• Diastole

• Ventricular Kick

Which cells are referred to as the hardwiring of the heart?

• Myocardial Cells

• Pacemaker Cells

• Power-Making Cells

• Electrical Conducting Cells

Which cells are referred to as the contractile machinary of the heart?

• Myocardial Cells

• Pacemaker Cells

• Power-Making Cells

• Electrical Conducting Cells

Which characteristic of cardiac cells gives them the ability to send electrical impulses through the heart?

• Contractility

• Conductivity

• Automaticity

• Excitability