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Cardiac impulse is generated by specialized cardiac muscle cells known as pacemaker cells, primarily located in the sinoatrial (SA) node of the heart. These cells have the unique ability to spontaneously depolarize, initiating an electrical signal that spreads through the atria, causing them to contract. The impulse then travels to the atrioventricular (AV) node, where it is briefly delayed before passing to the ventricles, leading to their contraction. This coordinated sequence ensures efficient blood pumping throughout the heart and body.
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What does a defibrilator do?
It produces an electrical impulse used to restart the hearts' rhythm after a cardiac arrest.
Which electrolyte helps regulate cardiac impulse transmission and muscle contraction?
Potassium has the main direct effect on cardiac impulse transmission and muscle contraction. However, potassium (K+) and sodium (Na) have an inverse relationship; when one is increased the olther is decreased. In cardiac health, both must be balanced to effect homeostasis. This is why repeat electrolyte lab values and cardiac enzymes are so important in unstable cardiac patients.
How hydrostatic pressure is generated in the heart?
Hydrostatic pressure is generated by the systole (contraction of the ventricles).
When the heart stops beating because of interference of its electrical impulse it results in a condition called?
Cardiac Arrest.
What is the correct progression of the cardiac impulse?
The cardiac impulse progresses in a specific sequence: it starts at the sinoatrial (SA) node, which generates an electrical impulse that spreads through the atria, causing them to contract. The impulse then reaches the atrioventricular (AV) node, where it pauses briefly before traveling down the bundle of His, branching into the right and left bundle branches. Finally, the impulse moves through the Purkinje fibers, leading to the contraction of the ventricles. This coordinated progression ensures effective pumping of blood throughout the heart and body.
In an ECG pattern the P-Q interval indicates how long it takes for the cardiac impulse to travel from the?
An ECG pattern the P-Q interval indicates how long it takes for the cardiac impulse to travel from the SA node through the AV node.
What does contractile impulse mean?
Contractile impulse refers to the electrical signal that initiates contraction in muscle cells. In cardiac muscle, this impulse originates from the sinoatrial (SA) node, propagating through the heart to coordinate rhythmic contractions. In skeletal muscle, it results from signals transmitted by motor neurons. Overall, contractile impulses are crucial for the effective functioning of both cardiac and skeletal muscles.
An important landmark when taking the apical pulse before administering cardiac drugs is the?
point of maximum impulse (PMI)
The electrical impulse that causes the heart to contract is generated in the right atrium at the?
Sinoatrial, or SA node.
Which term refers to the period where no impulse can be generated even with intense stimulation?
Which term refers to the period whereby no neural impulses can be generated even with intense stimulation
What portion of the cardiac conduction system passes the impulse across the myocardium of both ventricles?
The portion of the cardiac conduction system that passes the impulse across the myocardium of both ventricles is the Purkinje fibers. These fibers distribute the electrical impulse rapidly throughout the ventricular myocardium, ensuring coordinated and efficient contraction of the ventricles. This system allows for synchronized beating of the heart, critical for effective blood pumping.
Where in the heart do electric impulses begin?
In a normal heart, the electrical impulse resulting in depolarization and contraction of the cardiac muscle originates in the sinoatrial (SA) node and propagates through the atria to the atrioventricular (AV) node before moving on to the ventricles. When the electrical impulse for muscle contraction is generated, it travels throughout the muscle of each atrium, causing atrial contraction. the impulse then travels to the atrioventricular (AV) node. according to Medical Assisting- administrative and clinical procedures with anatomy and physiology.
