Abigail, Emma, and Scarlett are studying EKG waveforms in class. During the P-wave of an EKG, which of the following best describes what is happening in the heart?

• Depolarization

• Repolarization

• Hyperpolarization

• Plateau phase

Luna and Aiden are studying EKGs in class. When they look at the QRS interval on the EKG, what is the main event happening in the heart at that moment?

• Depolarization

• Repolarization

• Resting potential

• Action potential plateau

Abigail and Charlotte are learning about the heart in science class. After the heart muscle contracts, which process helps the cardiac muscle cells return to their resting state?

• Repolarization

• Depolarization

• Excitation

• Contraction

Maya and Charlotte are studying EKG waveforms in class. They notice the T-wave and wonder what it represents. Can you help them out?

What does the T-wave on an EKG waveform represent?

• Repolarization

• Depolarization

• Contraction

• Plateau phase

Define depolarization in the context of cardiac physiology.

• The process by which cardiac cells become less negative, leading to contraction

• The process by which cardiac cells return to their resting negative state

• The process of muscle relaxation

• The process of oxygen exchange in the heart

Define repolarization in the context of cardiac physiology.

• The process by which cardiac cells return to their resting negative state after contraction

• The process by which cardiac cells become less negative, leading to contraction

• The process of muscle contraction

• The process of electrical conduction in nerves

Aria, Ethan, and Zoe are studying for their cardiology quiz! Can you help them out? Which part of the EKG waveform shows when the atria are contracting?

• P-wave

• QRS interval

• T-wave

• PR interval

Grace and Benjamin are studying EKGs in class. During the QRS interval of the EKG waveform, what is happening in the heart?

• Atrial contracting

• Ventricle contracting

• Ventricle relaxing

• Atrial relaxing

Aria and Nora are studying for their cardiology quiz! Can you help them out? During which phase does repolarization of the ventricles occur in the EKG waveform?

• P-wave

• PR interval

• QRS interval

• T-wave

Elijah and Sophia are learning about the heart in class. When their teacher asks, "What does depolarization mean in the context of cardiac physiology?" which answer should they choose?

• Relaxing

• Decompressing

• Refilling with blood

• Repolarizing