Cardiac Cycle and Heart Anatomy

The P wave of an ECG represents

• atrial diastole

• atrial systole

• ventricular systole

• ventricular diastole

 This triggers contraction in the atria:

• SA node
• AV node
• QT node
• AV Bundles

 This triggers contraction in the ventricle:

• SA node
• AV node
• QT node
• AV Bundles

What is going on in the heart during the P wave?

• SA node triggers contraction of the atria walls.

• AV node triggers contraction of ventricle, the main pumping action

• "Relaxing" / Refilling of the Atria

• "Relaxation" of the ventricle

What is going on in the heart during the R-wave, also known as the QRS complex?

• SA node triggers contraction of atria

• AV node triggers contraction of ventricle, the main pumping action

• "Relaxing" / Refilling of the Atria

• "Relaxing' of the ventricle muscle

What is going on in the heart during the T-wave?

• SA node triggers contraction of atria

• AV node triggers contraction of ventricle, the main pumping action

• "Relaxing" / Refilling of the Atria

• "Relaxing" of the ventricle walls

Why are the walls of the left ventricle thicker than that of the right ventricle?

• The left ventricle must force blood into all the capillaries of the lungs 
• the left ventricle doesn't skip leg day
• This is false, the walls of the right ventricle are thicker
• Blood from the left ventricle is pumped throught the entire body 

On this diagram, the AV node is located at...

• A
• B
• C
• D

The place where the electrical current starts, and which is considered the heart's pacemaker, is the...

• sinoatrial node 
• right atrium
• atrioventricular node 
• left ventricle

Label A is the...

• AV Node
• SA Node
• Atrial Node
• Superior Vena Cava Node

Tags

NGSS.MS-LS1-3