What is the definition of atrioventricular?

Answer 1

To originate muscle contractions and regulate the rhythm of the heart.

Dictates the heart rate at 70 - 80 beats per minute when the body is at rest. It originates the electrical impulse for the entire conduction system of the heart.

Answer 2

Atrioventricular pertains to the connection between the atria (upper chambers of the heart) and the ventricles (lower chambers of the heart). The atrioventricular node is a cluster of cells in the heart that helps regulate the electrical signal between the atria and ventricles.

Answer 3

The sinoatrial node (SA) node is located in the right atrium of the heart, it initiates the electrical signal. (Important concept: Electricity travels much faster through nerve tissue than muscle tissue) After the SA node fires the electrical signal travels in all directions, through the heart muscle in both atrium, and it travels towards the ventricles through nerve cells. Before it reaches the ventricles the nerve cells pass through the atrioventricular node (AV) node. The AV node slows the passing signal down; this gives the atrial muscles time to depolarize or contract. The AV node will also block too many signals from the atrium such as within atrial fibrillation. The AV node will also act as a backup pacemaker in case the primary pacemaker or the SA node fails. The human heart can be compared electrically as follows: The SA node is the capacitor, the AV node is a resistor.

Answer 4

Atrioventricular valves are two in number. Mitral valve is between the left atrium (upper chamber) and left ventricle (lower chamber). Tricuspid valve is between the right atrium (upper chamebr) and right ventricle (lower chamber). Mitral valve closes when the left ventricle contracts, to prevent back flow of blood into the left atrium. Tricuspid valve closes when the right ventricle contracts. Hence the blood from the ventricles are able to go out of the heart into the blood vessels during ventricular contraction. Mitral and tricuspid valves open when the ventricles relax, permitting blood to enter the ventricles from the atria. This blood is pumped out when the ventricles contracts next time.

Answer 5

It triggers the contraction of the ventricles (ventricular systole) during the cardiac cycle. The impulse races down the septum in the bundle of His, then reaches the cardiac muscle cells via the Tawara branches and Purkinje fibers, so the ventricles contract from the bottom upwards. (This makes sense because the outlets for the blood flow are at the top.)

Answer 6

Heart has four chambers. Right atrium, left atrium, right ventricle and left ventricle. You have right atrioventricular or tricuspid valve. Left aterioventricular or bicuspid or mitral valve. You have a sino atrial node called as 'pacemaker', situated in right atrium. Wave of conduction flows along the walls of atria, leading to contraction of both of them. Then it slows down at AV node. Then it passes through 'Bundle of HIS (GOD.) to both ventricles. It leads to ventricular contractions. Inherent rythmicity of SA node is 72/minute, that of atrial cells is about 60/ minute, that of Av node is about 50/minute and that of ventricles is 36/minute. "So atrioventricular means anything related to atria and ventricles". (When atria contracts you get 'P' wave in E.C.G. QRS complex corresponds to ventricular contraction. 'U' wave corresponds to recovery wave. Deep Q wave indicates old myocardial infarction. Elevation of s ST segment with 'T' wave invertion indicates myocardial infarction.)

Answer 7

the atrioventricular valves blood away from the heart into the arteries

Answer 8

The AV node plays a role in the regulation of the heart beat/rhythm. It is an "initiator" of sorts.

Answer 9

The AV node provides the path of least resistance for the impulse to proceed to the ventricles.

Answer 10

The AV node is the atrio-ventricular node, which assists in regulating the heartbeat (along with the SA or sino-atrial node).