Question

What is in control of "twisting" the ventricular walls in order to squeeze out all the blood into the aorta or pulmonary trunk? Group of answer choices purkinje fibers AV nodes SA nodes pacemaker cells

Answer 1

The correct answer is:

Purkinje fibers

Step-by-step explanation:

The human heart is an organ, made up majorly of muscles called cardiac muscles, and is responsible for pumping blood throughout the body. The cycle of coordination of blood flow through the heart is known as the cardiac cycle and the process is coordinated by the cardiac conduction system.

The process starts with the sinoatrial (SA) node, also known as pacemakers, causing the generation of impulses that travel through the heart causing the contraction of the atrium (upper part of the heart). This impulse moves to the AV bundle (bundle of His), which branches out, spreading into enlarged fibers called Purkinje fibers. When the impulses reach the Purkinje fibers, it generates the contraction of the ventricular walls in a twisting motion, forcing blood into the aorta.