BCH5413 EXAM 3 CERTIFICATION EVALUATION TEST PAPER 2026 QUESTIONS AND SOLUTIONS GRADED A+

BCH5413 EXAM 3 CERTIFICATION
EVALUATION TEST PAPER 2026
QUESTIONS AND SOLUTIONS GRADED A+

●● Bundle branches
Answer: Convey(s) the impulse down the interventricular septum.


●● SA node
Answer: Set(s) the pace for the entire heart.


●● AV node
Answer: Delay(s) occurs here while atria contract.


●● Purkinje fibers
Answer: Convey(s) the impulse throughout the ventricular walls.


●● Internodal pathways
Answer: Link(s) between the SA node and the AV node.


●● T or F?
The pace of the heart is set by the pacemaker cells with the fastest rate of
spontaneous depolarization. Normally, these are the cells found in the

, SA node, within the wall of the right atrium. This is where depolarizing
impulses normally originate.
Answer: True


●● Which of these structures conduct(s) action potentials the slowest?
Answer: AV node


●● Which chamber pumps oxygenated blood out the aorta to the
systemic circuit?
Answer: left ventricle


●● T or F?
The ECG wave tracing represents contractile activity in the heart.
Answer: False


●● What does the QRS complex represent in the ECG wave tracing?
Answer: ventricular depolarization


●● Repolarization of an autorhythmic cell is due to the opening of
which channels?
Answer: voltage-gated potassium channels


●● End Systolic Volume (ESV)