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WorksheetsPBS - 2.1 EKG review Quiz
Total questions: 15
Worksheet time: 45mins
How does the heart's electrical conduction system ensure coordinated contractions?
By randomly activating the heart muscles
By sequentially activating the atria and ventricles
By causing the heart to beat faster during exercise
By allowing the heart to rest between beats
What are the Bundle of His and its function?
The Bundle of His conducts impulses from the AV node to the ventricles.
The Bundle of His regulates blood flow in the heart.
The Bundle of His is responsible for oxygen exchange in the lungs.
The Bundle of His produces hormones that control heart rate.
What is depolarization in the context of the cardiac cycle?
A process where cardiac muscle cells become less negative, leading to contraction.
A phase where the heart relaxes and fills with blood.
The electrical signal that initiates the heartbeat.
A condition where the heart rate decreases significantly.
What is the function of the SA node in the heart?
It regulates blood pressure.
It acts as the natural pacemaker, initiating the electrical impulse that triggers heartbeats.
It pumps oxygenated blood to the body.
It filters impurities from the blood.
What is the difference between atrial and ventricular contraction?
Atrial contraction occurs first, followed by ventricular contraction, ensuring efficient blood flow through the heart.
Ventricular contraction occurs first, followed by atrial contraction, which is less efficient.
Atrial and ventricular contractions occur simultaneously, maximizing blood flow.
Atrial contraction is stronger than ventricular contraction, leading to more effective pumping.
What is the role of the cardiac cycle in heart function?
The cardiac cycle refers to the sequence of events in one heartbeat, including contraction and relaxation phases.
The cardiac cycle is the process of blood being pumped from the heart to the lungs only.
The cardiac cycle involves the electrical signals that initiate heartbeats without any physical contraction.
The cardiac cycle is the period of time when the heart is at rest and not pumping blood.
What does the P-wave on an EKG represent?
The P-wave represents ventricular contraction.
The P-wave correlates with atrium contraction and signals moving from the SA node to the AV node.
The P-wave indicates the heart's resting state.
The P-wave is associated with the repolarization of the ventricles.
Where are the Purkinje fibers located in the heart?
In the atria
At point I
In the ventricles
In the sinoatrial node
What does the T-wave on an EKG indicate?
The T-wave correlates with ventricle repolarization.
The T-wave indicates atrial depolarization.
The T-wave represents ventricular contraction.
The T-wave shows the heart rate.
What is repolarization in the context of the cardiac cycle?
The process where cardiac muscle cells return to their resting negative state after contraction.
The phase where the heart muscles contract and pump blood out of the heart.
The period of time when the heart is at rest and filling with blood.
The mechanism by which the heart rate increases during exercise.
What role does the AV node play in the heart's electrical conduction system?
The AV node generates electrical impulses for the heart.
The AV node receives impulses from the SA node and delays them before passing them to the ventricles.
The AV node is responsible for pumping blood to the lungs.
The AV node connects the atria and ventricles directly without delay.
How can EKG readings be used in medical diagnosis?
EKG readings can help diagnose arrhythmias, heart attacks, and other cardiac conditions by analyzing electrical activity.
EKG readings are primarily used to measure blood pressure levels.
EKG readings can only be used to monitor heart rate during exercise.
EKG readings are used to assess lung function and respiratory issues.
What is the sequence of the cardiac cycle in terms of electricity?
polarization → repolarization → depolarization
depolarization → polarization → repolarization
polarization → depolarization → repolarization
repolarization → depolarization → polarization
What marks the end of the cardiac cycle in the electrical pathway of the heart?
Sinoatrial Node
Atrioventricular Node
Purkinje Fibers
Bundle of His
What is the significance of the QRS complex on an EKG?
It represents atrial depolarization, leading to atrial contraction.
It indicates the heart rate and rhythm.
It represents ventricular depolarization, which leads to ventricular contraction.
It shows the repolarization of the ventricles.
