Patho CVS 204 - Exam 1 Latest Update 2025-2026

Patho CVS 204 - Exam 1 Latest Update 2025-2026 100 Questions and 100% Verified Correct Answers Guaranteed A+ atrial diastole/ventricular systole - CORRECT ANSWER: Atrial is filling and contraction of ventricles

atrial systole/ventricular diastole - CORRECT ANSWER: Atrial is contracting and

ventricles are filling with blood

AV node (atrioventricular node) - CORRECT ANSWER: - AV junction incl. the AV node and Bundle of His

• Electrical Bridge btw Atria and Ventricle
• Located at base of IAS extending to Ventricular septum
• Impulses delayed slightly
• 40-60bpm
• Allows for ventricular filling
• Area vulnerable to blocks in conduction
• Located on the Rt side of the IAS immediately behind the TV and near the opening of

the coronary sinus.

• In most adults, the AV node is supplied by the RCA. Otherwise it is supplied by the Lt

circumflex artery

AV Node 3 functional regions - CORRECT ANSWER: - Arial nodal (AN) - upper

junctional region or transitional zone

• The nodal (N) region - midportion of AV node
• The nodal HIS (NH) - lower junction region. Fibers of AV node merge gradually

w/bundle of HIS

Bundle of HIS - CORRECT ANSWER: - Thin bundle of subendocardial threads 1 / 2

• located Rt side of IAS just above the ventricles
• Bifurcates into Rt and Lt bundle branches
• Electrical impulses pass through AV node to bundle of HIS
• It is normally the only electrical connection btw the atria and ventricles
• Receives blood from branches of the anterior and posterior descending coronary

arteries.

• Due to its blood supply, it is less vulnerable to ischemia damage
• 20-40 bpm

Can blood stay static with the Tribeculae Carnae lining? - CORRECT ANSWER: No

Endocardium - CORRECT ANSWER: Thin smooth inner layer, composed of

endothelium.

Epicardium - CORRECT ANSWER: Thin smooth outside layer

Intrinsic Rates - CORRECT ANSWER: SA Node - 60-100bpm

AV Node - 40-60bpm Ventricular 20-40bpm (purkinje fibers)

Left Atrium - CORRECT ANSWER: - Is the most posterior structure of the heart.

• The LA receives oxygenated blood from the 4 pulmonary veins, two on the right and

two on the left.

• The pulmonary veins drain blood into the medial part of the LA.
• LA smaller than the RA
• LA wall thickness 2mm
• The walls are slightly thicker due to the higher pressure found in the left side of the

heart.

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