Question

‘Bundle of His’ is a network of
(a)Muscle fibers distributed throughout the heart walls.
(b)Muscle fibers found only in the ventricle wall.
(c)Nerve fibers distributed in ventricles.
(d)Nerve fibers found throughout the heart.

Answer 1

Hint: A collection of heart muscles for the electrical conduction from the right ventricle of the heart to regulate the heartbeat in the human body.

Complete answer:
‘Bundle of His’ is a network of muscle fibers, found in the walls of ventricles. It transmits the electrical impulses from the AV node to the point of the apex via bundle branches.
These fascicular bundle branches then lead to the Purkinje fibers which provide electrical conduction to the ventricles, causing the cardiac muscle of the ventricles to contract at a paced interval.

Additional Information: -The bundle of His consists of wide, fast-conducting muscle fibers that carry the cardiac impulse through the insulating annulus fibrosus into the fibrous upper part of the ventricular septum. There, it becomes the left bundle branch and the right bundle branch.
-The left and right branches of this bundle, and the Purkinje fibers, will also produce a spontaneous action potential at a rate of 30-40 beats per minute, so if the SA and AV nodes both fail to function, these cells can become pacemakers.
-If the bundle of His got damaged then it can lead to heart blocks ranging from AV conduction delays to a complete disconnect in the electrical conduction between the atria and ventricles.
-If the bundle of His stops working then the rate and rhythm of the heartbeat is not affected, but the impulse is slowed.
-The disorder leading to the block of the conduction to the heart is called the bundle block or the heart block.
So, the correct answer is Muscle fibers found only in the ventricle wall.

Note: Bundle of His was discovered in 1893, by Swiss Cardiologist and anatomist Wilhelm His Jr., it is named after him while in 1839 Jan Evangelista Purkyne discovered the Purkinje fibers and is named after him.