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Which structure of the heart provides the stimulation that causes the ventricles to contract?
purkinje fibers
Where is blood pumped when ventricles contract?
Into the heart
What is bundle of His in cardiology?
The Bundle of His (Hiss) is a bundle of electrical nodes which allow the ventricles to contract. The bundle is located in the ventricular septum which divides the two ventricles and separates into the Perkinje fibers at the apex of the heart. It is located in the myocardium.
Do the ventricles contract at the apex or at the base of the heart?
Not really sure what you mean by the base, the ventricles contract from the Apex (which is at the bottom) upwards.
Where does ventricular contractions start?
Ventricular contractions start in the Purkinje fibers, which are specialized muscle fibers located in the walls of the ventricles of the heart. These fibers rapidly conduct the electrical signals to synchronize the contraction of the ventricles and pump blood out of the heart.
What contract together to pump blood?
The ventricles contract to pump blood out of the heart.
What are the roles of the sino atrial nodes?
the sinoatrial (SA) node is the "pacemaker" of the heart-it is the first stucture that makes up the conduction system of the heart-the system of electrical impulses that are discharged throughout the heart and cause rhythmic cardiac contractions and relaxations. impulse conduction starts in the SA node, causing the atria to contract, then goes to the atrioventricular (AV) node, the bundle of His, and then to the pukinje fibers which cause the ventricles to contract.
Why is it an advantage for the ventricles to contract from the bottom?
The pulmonary artery and the aorta lead upward and away from the ventricles. Since the ventricles contract from the bottom, blood is more efficiently pushed out of the heart.
If the atrioventricular node could be surgically removed from the heart without disrupting signal transmission to the Purkinje fibers what would be the effect?
Atria and ventricles would contract at about the same time.
Does the AV node initiates the contraction of the atria?
No, the sinoatrial (SA) node initiates contraction of the atria, which subsequently causes stimulation of the AV node, which then initiates contraction of the ventricles via the Purkinje fibers.
What are the electrical impulses in the heart that are relayed to the ventricles by what?
A junction box, also known as the AV node, is how electrical impulses in the heart are relayed to the ventricles. The ventricles help make the muscle contract and then pump the blood.
The actual contraction of the ventricles of the heart is stimulated by?
Sinoatrial (SA) Node or "Pacemaker"
