Posterior Interventricular Sulcus and Heart Blood Pathway

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What is responsible for the coordinated contraction of the Atria and Ventricles in the heart?

AV Node

Bundle of His

Intercalated Discs (correct)

SA Node

Which part of the heart is responsible for the gradual depolarization known as 'Prepotential'?

SA Node (correct)

R & L Bundle Branches

Purkinji Fibres

AV Node

Which component allows action potentials to move from cell to cell in the heart?

Purkinji Fibres

Gap Junctions (correct)

Bundle of His

Intercalated Discs

What leads to the opening of Ca2+ channels and influx of Ca+ in Conductile Cardiac Cell Physiology?

Threshold reached due to Ca+ movement Signup and view all the answers

Which structure is part of the sequence of the Heart's Conduction System just before the Purkinji Fibres?

R & L Bundle Branches Signup and view all the answers

'Spontaneously Depolarises to Threshold' in cardiac cells is primarily due to:

Leaky Na+ Membrane Ion Channels Signup and view all the answers

Which node in the heart sets the pace for the heart as a whole?

SinoAtrial (SA) Node Signup and view all the answers

Where is the location of the AtrioVentricular (AV) Node in the heart?

Inferior portion of the InterAtrial Septum; directly above the Tricuspid Valve Signup and view all the answers

What is the normal resting heart rate maintained by the Parasympathetic Nervous System?

60-70bpm Signup and view all the answers

How long does it take for an action potential to reach the AtrioVentricular (AV) Node from the SinoAtrial (SA) Node?

50ms Signup and view all the answers

Which region of the heart contracts when stimulated by the SinoAtrial (SA) Node?

Right & Left Atrium Signup and view all the answers

What does the Posterior Interventricular Sulcus separate?

The right and left ventricles posteriorly Signup and view all the answers

What does the Anterior Interventricular Artery supply?

The left ventricle Signup and view all the answers

In which circulation does blood gain oxygen and lose carbon dioxide?

Pulmonary circuit Signup and view all the answers

Which artery encircles the heart in the coronary sulcus?

Left Coronary Artery Signup and view all the answers

What is the significance of arteries lying in the epicardium in coronary circulation?

Prevents the contractions from inhibiting bloodflow Signup and view all the answers

Which artery is also known as the Left Anterior Descending Artery (LAD)?

Anterior InterVentricular Artery Signup and view all the answers

What is the role of the Bundle Branches in the heart's conduction network?

Conduction of impulses from the AV Node to the Purkinje Fibres Signup and view all the answers

Where are the Purkinje Fibres located within the heart?

Just below the Endocardium in the Inner Ventricular Walls Signup and view all the answers

What is the nature of action potentials in the Bundle Branches compared to the AV & SA Nodes?

Continually Depolarising but faster Signup and view all the answers

Which part of the myocardium do the Bundle Branches serve?

Transmits impulses from the AV Node to the R & L Bundle Branches Signup and view all the answers

What is the significance of delaying impulses by the Atrioventricular (AV) Node?

Creates a pause for Atria to empty their contents before Ventricular Contraction Signup and view all the answers

What differentiates Purkinje Fibres from other myocardial cells during impulse transmission?

Lack of gap junctions connecting them to adjacent cells Signup and view all the answers

What does a positive deflection result in when a Depolarisation Wavefront moves toward a positive electrode?

A positive deflection in the corresponding lead Signup and view all the answers

What is the significance of the P-wave in an ECG?

Indicates atrial contraction is occurring Signup and view all the answers

Why is only the negative deflection seen in the Q-Wave during an ECG?

Signal cancellation by Atrial Repolarization Signup and view all the answers

What is indicated by a negative deflection when a Depolarisation Wavefront moves away from a positive electrode?

A negative deflection in the corresponding lead Signup and view all the answers

What does the PR-Segment reflect in an ECG reading?

Delay between SA Node & AV Node Signup and view all the answers

Why does a Depolarisation Wavefront moving perpendicular to a positive electrode create both positive and negative deflections?

The direction of wave movement relative to the Main Electrical Axis Signup and view all the answers