0
The normal, or natural, pacemaker of the heart is the sinoartial node, it passes the action potential to the ventricular node, which slows it down long enough for the ventricles to fill up with blood. Then the second contraction is triggered by the action potential traveling down the Bundle of His, or atrioventricular bundle, and then spread out the signal to the Purkinje fibers which transmit the action potentiall to all parts of the ventricles.
The inpulse starts in the sino atrial (SA) node then passes to the atrioventrivular (AV) node. From here the impulse passes down the septum in the bundle of His and then bundle branches which finally become the the purkinje fibres that spread the impulse all over the heart.
SA-node,AV-node.bundle of his and purkinge fibres.
First the SA node fires then the impulse goes to the AV node down to the Bundle of His to the Purkinji Fibers then the ventricles contract.
The pathway of an impulse through the heart:
Sinoatrial node
Atrioventricular node
Bundle of HIS
Left and Right Bundle Branches
Purkinje fibers
Here is a link that explains the process and has a picture of the path in the ralted links section.
SA node to AV node to AV bundle to bundle branches to purkinje fibers
Add your answer:
Earn +20 pts
Describe the pathway of blood through the heart and lungs relating to pressure and volume?
Describe the pathway of blood through the heart and lungs relating to pressure and volume? Describe the pathway of blood through the heart and lungs relating to pressure and volume?
What is Wolff-Parkinson-White syndrome?
An abnormal, rapid heart rhythm, due to an extra pathway for the electrical impulses to travel from the atria to the ventricles.
What characterizes the normal operation of the heart?
each part contracts in a specific order. Contraction of the muscle is triggered by an electrical impulse. These electrical impulses travel through specialized cells that form a conduction system. Following this pathway ensures that contractions will
What is the sound of your heart beating?
The atria and ventricles work together, alternately contracting and relaxing to pump blood through your heart. The electrical system of your heart is the power source that makes this possible. Your heartbeat is triggered by electrical impulses that travel down a special pathway through the heart.
What is happening during a complete heart block?
Complete heart block is where the electrical impulses from the SA node of the heart cannot reach the ventricles along the normal pathway. Instead the atrial contract from the SA node singles and the ventricles contract from the ventricular cells
Describe the location and action of a pacemaker?
Pacemaker is located in the right atrium and generates electrical impulses to start a muscle contraction in the heart.
Where do nerve impulses travel from to enter the bundle branches?
Nerve impulses come through the sinus node of the heart to the bundle of His and then move into the right and left bundle branches.
Impulses that are carried to the heart by means of the vagus nerve are?
Parasympathetic impulses and cause the heart rate to decrease.
What is the name for extra pathway in the heart?
While the question seems a bit unclear, in reference to electricle pathways: an extra pathway in the heart is termed an "accessory" pathway.
What is The precision of these electrical impulses ensures that blood flows through the heart in the right direction?
The blood goes through the heart in the correct direction because there are a number of one-way valves in the heart chambers that blood can only pass through in the correct direction.
What is the medical term meaning interruption of the electrical impulses in the heart's conduction system?
Heart block is the term meaning interruption of electrical impulses in the heart's conduction system.
What is the interruption of these impulses in the heart's conduction system?
Interruption of the impulses in the heart's conduction system is known as heart block. Heart block may be caused by scar tissue from a heart attack, among other things.
