Electrical Impulses Lab

1% of muscle cells?

generate electrical signals that coordinate contractions

Cardiac conduction system

a system of specialized muscle tissues that conducts electrical impulses that stimulate the heart to beat

Pacemaker

A group of cells located in the right atrium that sends out signals that make the heart muscle contract and that regulates heart rate.

Internodal fibers impulses

Transmits electrical impulses from the SA node to the AV node. modified cardiac muscle cells.

SA node impulses

Specialized cluster of cells that generate electrical impulses. Primary pacemaker of the heart

AV node impulses

slows the electrical impulse from the atria to allow them to fully contract and fill the ventricles with blood before the ventricles themselves contract. It acts as an electrical "gatekeeper" and an intrinsic pacemaker

AV Bundle (His Bundle) impulses

Receives electrical impulses from the AV node and transmits them to the Right and Left bundles

Right and Left bundle branches impulses

Split from the bundle of His and carry electrical impulses to the right and left ventricles

Purkinje fibers impulses

Receives impulses from the right and left bundles, thus rapidly distributing electrical impulses to the ventricular myocardium, ensuring a coordinated and synchronized contraction of the ventricles for efficient blood pumping

Cardiac muscle long refractory period

allows time for the heart to relax and fill with blood after each contraction, preventing tetany and ensuring a rhythmic and effective pumping action

ECG

a test that records the electrical activity of the heart. It measures the heart rate, rhythm, and electrical signals produced by the heart muscle

Atrial systole

Atria contract, pushing blood into ventricles. Ventricles are relaxed

Ventricular systole

Ventricles contract, ejecting blood to the body. Atria relaxed

P

Atrial depolarization

QRS

Atrial repolarization and ventricular depolarization

T

Ventricular repolarization

Order of electric impulses

SA node, internodal fiber, AV node, AV bundle, Right + Left branches, bundle branches, purkinje fibers, myocardium in the ventricles

SA node

Internodal pathways

Bundle of his

Right and left bundle branches

Purkinje fibers

Where is the SA node located?

In the right atrium

Where is the internodal pathway

In the right atrium, connecting the SA node and AV node

Where is the AV node

Near the bottom of the right atrium and the interatrial septum

Where is the bundle of his?

Within the top of the interventricular septum

Where are the left and right bundle branches?

In the interventricular septum

Where are the purkinje fibers?

In the ventricle walls

Autorhythmic

cells that can generate and rhythmically conduct electrical impulses to initiate contractions without external nervous or hormonal stimulation

Chest leads

V1 through V6. Specific electrode placements that provide a horizantal view of the heart’s electrical activity

Chest leads

Limb leads

a set of electrodes used in ECG to measure the electrical activity of the heart from different angles in the vertical planes. I, II, III, aVR, aVL, and aVF

Limb leads