Understanding the Heart's Electrical Conduction System

What is the primary purpose of understanding coronary circulation in the context of EKG interpretation?

• To predict future heart conditions

• To understand the heart's mechanical functions

• To diagnose blood supply issues

• To interpret electrical activity patterns

What is the role of the SA node in the heart?

• It delays the electrical signal to the ventricles

• It is the heart's primary pacemaker

• It conducts signals to the left atrium

• It bifurcates into the bundle branches

What is the significance of the AV node's location?

• It's near the left atrium for easier signal transmission

• It's positioned to delay the signal to the ventricles

• It's located outside the heart for protection

• It's central to distribute the signal equally

Which component of the electrical conduction system is responsible for ensuring the atria contract before the ventricles?

• Purkinje fibers

• AV node

• Bundle of His

• SA node

What is the primary function of the Purkinje fibers?

• To depolarize the ventricular myocytes

• To initiate the heart's contraction

• To delay the electrical signal

• To bifurcate into the bundle branches

How does the body's backup system for pacemaking work?

• By directly stimulating the ventricles

• By decreasing the heart rate

• By activating lower level pacemakers if the primary fails

• By increasing the heart rate

Tags

NGSS.HS-LS1-3

What is the intrinsic rate of the SA node?

• 60 to 100 beats per minute

• 45 to 50 beats per minute

• 40 to 45 beats per minute

• 20 to 40 beats per minute

What role does calcium play in muscle contraction?

• It activates the sodium-potassium pump

• It stabilizes the resting potential

• It helps myosin and actin to bind

• It initiates the repolarization phase

What is the cardiac conduction system responsible for?

• being just another thing i have to learn in class

• providing the spark to initiate muscle contraction

• pushing blood through the circulatory system

• being a way for doctors to monitor heart rate

Tags

NGSS.HS-LS1-3