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What is the point in the purkinje system where the impulse is temporarily delayed?
The point in the Purkinje system where the impulse is temporarily delayed is at the atrioventricular (AV) node. This delay allows the atria to fully contract and pump blood into the ventricles before the impulse is transmitted to the ventricles, ensuring efficient blood flow through the heart.
How an impulse can continue to travel along a nerve pathway when there's a gap between two neurons?
An impulse can continue to travel along a nerve pathway when there's a gap between two neurons through a process called synaptic transmission. At the gap, known as a synapse, neurotransmitters are released by the sending neuron, which then bind to receptors on the receiving neuron, triggering a new electrical signal to continue the impulse along the nerve pathway.
How does an impulse travel through the heart?
An impulse travels through the heart by moving from the sinoatrial (SA) node to the atrioventricular (AV) node, then through the bundle of His, the bundle branches, and finally to the Purkinje fibers. This pathway coordinates the contraction of the heart muscle, leading to a synchronized heartbeat.
What is the correct sequence of cardiac electrical activity?
The impulses from SA node spread through out the atrial musculature in about 0.09 seconds, and parallel to it, the impulses also reach the AV node. From AV node, after a delay of about 0.12 seconds they pass to the inter ventricular septum through the Bundle of His, which soon divides into Left and Right Bundle branch and ultimately into the Purkinje fibers which first depolarize the endocardium of the ventricles and then the rest of ventricular musculature. SA Node --> Atria, AV node --> Bundle of His --> Right & Left Bundle Branches --> Purkinje fibers
What pathway does the blood flow when the ventricles undergo contraction?
When the ventricles contract, the right ventricle pushes blood up through the pulmonary semilunar valve into the pulmonary arteries via the pulmonary trunk, and the left ventricle pushes blood up through the aortic semilunar valve into the Aorta.
Why do the AV valves close in response to the contraction of the ventricles?
The AV valves close in response to the contraction of the ventricles to prevent the backflow of blood from the ventricles into the atria, ensuring that blood flows in the correct direction through the heart and body.
The neurotransmitters of a neutron enable a nerve impulse to do what?
Neurotransmitters in a neuron allow a nerve impulse to be transmitted from one neuron to another by crossing the synapse and binding to receptors on the receiving neuron. This triggers an electrical or chemical signal to continue the nerve impulse along the neural pathway.
Why does the heart have the Bundle of His and the Purkinje fibers?
The bundle of His and the Purkinje fibres are part of the conduction system of the heart. In order to pump blood around the body, the heart muscle must contract (atria first to fill the ventricles, then ventricles contract to send the blood around the body.) The conduction system starts in the sinoatrial node (SA node) which is also known as the hearts natural pacemaker and is located at the top of the right atrium. The impulse is then sent to the atrioventricular node (AV node) located by the junction between the atria and ventricles. The next part of the conduction system is the bundle of His which sends the impulse from the atria to the ventricles. The purkinje fibres then spread through the ventricles. As the impulse passes through each part of the conduction system, that part of the heart is excited and the heart muscle contracts, which gives the pumping action of the heart.
Describe the pathway of nerve impulses through the heart?
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.
What happens during the p-r interval?
During the P-R interval on an ECG, the electrical impulse travels from the atria to the ventricles through the AV node and the bundle of His. It represents the time it takes for the atrial depolarization to reach the ventricles, allowing for coordinated contraction and efficient pumping of blood.
What is the QRS spike of an ECG mean?
a group of waves depicted on an electrocardiogram; it actually consists of three distinct waves created by the passage of the cardiac electrical impulse through the ventricles and occurs at the beginning of each contraction of the ventricles. In a normal electrocardiogram the R wave is the most prominent of the three; the Q and S waves may be extremely weak and sometimes are absent.
What is correct pathway for elimination?
The correct pathway for elimination in the body involves filtration of waste products from the blood by the kidneys, excretion of waste through urine, elimination of solid waste through the bowel movements, and removal of waste gases through respiration. Each of these processes plays a vital role in maintaining the body's internal environment.
