Cardiac Conduction System

What is the main purpose of Purkinje fibers in the cardiac conduction system?

• To produce hormones for heart function

• To regulate blood pressure in the atria

• To store excess electrical impulses

• To rapidly conduct electrical impulses throughout the ventricles

Where are Purkinje fibers located in the heart?

• Outer ventricular walls of the heart

• Inner ventricular walls of the heart

• Pericardium

• Atria of the heart

How do Purkinje fibers differ from other cardiac muscle cells?

• Purkinje fibers have a smaller diameter compared to other cardiac muscle cells. higheir contractile force compared to other cardiac muscle cells.

• Purkinje fibers have a lower conduction velocity compared to other cardiac muscle cells. higheir contractile force compared to other cardiac muscle cells.

• Purkinje fibers have more myofibrils compared to other cardiac muscle cells. higheir contractile force compared to other cardiac muscle cells.

• Purkinje fibers have a higher conduction velocity, larger diameter, fewer myofibrils, and lower contractile force compared to other cardiac muscle cells.

What role do Purkinje fibers play in the transmission of electrical impulses?

• Purkinje fibers transmit electrical impulses from the bundle of His to the ventricles.

• Purkinje fibers are responsible for regulating blood pressure.

• Purkinje fibers transmit electrical impulses from the atria to the ventricles.

• Purkinje fibers aid in the digestion process.

What happens if there is a dysfunction in the Purkinje fibers?

• Improved digestion

• Increased blood pressure

• Enhanced lung function

• Irregular heart rhythms or arrhythmias

How do Purkinje fibers contribute to the coordination of heart contractions?

• Purkinje fibers conduct electrical impulses quickly to ensure synchronized heart contractions.

• Purkinje fibers secrete hormones to control heart rate

• Purkinje fibers regulate blood pressure in the arteries

• Purkinje fibers store excess blood in the heart chambers

What is the significance of Purkinje fibers in maintaining a regular heart rhythm?

• Purkinje fibers aid in the production of red blood cells.

• Purkinje fibers help regulate blood pressure instead of heart rhythm.

• Purkinje fibers are responsible for storing excess nutrients in the heart.

• Purkinje fibers conduct electrical impulses quickly to ensure coordinated contraction of the heart chambers and maintain a regular heart rhythm.

How are Purkinje fibers different from sinoatrial (SA) node cells?

• Purkinje fibers conduct electrical impulses, while SA node cells initiate the heartbeat.

• SA node cells conduct electrical impulses, while Purkinje fibers initiate the heartbeat.

• SA node cells are responsible for the contraction of the heart, while Purkinje fibers regulate heart rate.

• Purkinje fibers are located in the atria, while SA node cells are located in the ventricles.

Explain the pathway of electrical conduction involving Purkinje fibers.

• SA node -> AV node -> Bundle of His -> Purkinje fibers

• SA node -> AV node -> Purkinje fibers

• AV node -> Bundle of His -> Purkinje fibers

• SA node -> Bundle of His -> Purkinje fibers

Why are Purkinje fibers considered essential for proper heart function?

• Purkinje fibers aid in the production of red blood cells in the heart. heart function because they help in the synchronized contraction of the ventricles, ensuring efficient pumping of blood.

• Purkinje fibers are essential for proper heart function because they help in the synchronized contraction of the ventricles, ensuring efficient pumping of blood.

• Purkinje fibers are responsible for blood clotting in the heart. heart function because they help in the synchronized contraction of the ventricles, ensuring efficient pumping of blood.

• Purkinje fibers help in regulating blood pressure in the heart. heart function because they help in the synchronized contraction of the ventricles, ensuring efficient pumping of blood.