Heart Excitation & Cardiac Cycle

#1 is pointing to the:

• SA node

• AV node

• AV bundle

• Purkinje fibers

#2 is pointing to the:

• SA node

• AV node

• AV bundle branches

• Purkinje fibers

Tags

NGSS.HS-LS1-3

#6 is pointing to the:

• SA node

• AV node

• AV bundle

• AV bundle branches

#3 is pointing to the:

• AV node

• AV bundle

• AV bundle branches

• Purkinje fibers

#7 is pointing to the:

• AV node

• AV bundle

• AV bundle branches

• Purkinje fibers

What is happening during the P wave?

• Atrial repolarization (atrial diastole)

• Atrial depolarization (atrial systole)

• Ventricular repolarization (ventricular diastole)

• Ventricular depolarization (ventricular systole)

What is happening during the QRS complex?

• Atrial repolarization (atrial diastole)

• Atrial depolarization (atrial systole)

• Ventricular repolarization (ventricular diastole)

• Ventricular depolarization (ventricular systole)

What is happening during the T wave?

• Semilunar valves close

• Atria are in systole

• Ventricles are in diastole

• Ventricles are in systole

When do the AV valves close?

• P wave

• PR segment

• ST segment

• T wave

Tags

NGSS.HS-PS2-5

What causes valves to open during the cardiac cycle?

• They open to let air through

• Changes in pressure in the atria, ventricles, pulmonary artery, and aorta

• They open to let blood flow back and forth between chambers

• When the pressure drops suddenly