Conductive System of the Heart

What is the primary function of the conductive system of the heart?

• To generate and conduct electrical impulses, ensuring the heart beats in a coordinated and rhythmic manner, and to control the rate and rhythm of the heartbeat.

• To pump blood directly into the lungs for oxygenation.

• To filter waste products from the blood before it enters the heart.

• To produce hormones that regulate blood pressure.

Which node is known as the 'Natural Pacemaker' of the heart?

• A. Atrioventricular (AV) Node

• B. Sinoatrial (SA) Node

• C. Bundle of His

• D. Purkinje Fibers

Where is the Sinoatrial (SA) Node located?

• In the ceiling of the right atrium.

• In the left ventricle.

• In the floor of the right atrium .

• In the aorta.

The Atrioventricular (AV) Node is located at the ______ between atria and ventricles.

• junction

• apex

• base

• wall

What is the function of the Bundle of His?

• It provides a pathway for electrical signals from the AV node to the ventricles and is located in the interventricular septum.

• It pumps blood directly from the atria to the aorta.

• It regulates the opening and closing of the heart valves.

• It produces red blood cells in the bone marrow.

The right and left bundle branches conduct impulses through the ______ and ______ ventricles.

• right, left

• left, right

• upper, lower

• anterior, posterior

Purkinje fibers ensure ______ contraction of the ventricles.

• coordinated

• delayed

• random

• weak

Arrange the following in the correct order of the pathway of an impulse in the heart:

• AV Node (slight delay)

• SA Node

• Bundle of His

• Atria contract

What effect does sympathetic stimulation have on heart rate?

• Increases heart rate

• Slows heart rate

• No effect on heart rate

Tags

NGSS.HS-LS1-3

What effect does parasympathetic stimulation (via the vagus nerve) have on heart rate?

• Increases heart rate

• Slows heart rate

• No effect on heart rate

Tags

NGSS.HS-LS1-3