What is the total delay time of the AV node?

Assuming normal conduction and contraction: At what part in an ECG is the left ventricle the most empty?

Fill in the blank: What is the purpose of the papillary muscles and chordae tendinae?

Short answer: Describe preload and afterload in your own words.

Please label the structure numbered 46 (be specific)

Fill in the blank: Actin attaches to _________ in unitary smooth muscle.

Short essay: From an impulse at the funny currents to the outer portions of the ventricles follow an impulse through the entire electrical conduction system of the heart. Describe all routes an impulse can possibly take in normal conduction (intranodal, bundle branches, etc.)

Fill in the blank: What are the four intranodal pathways?

In a sinus node cell what ion is primarily responsible for “funny currents”?

Short answer: Your R to R interval is 0.5s. What is the heart rate? (Assume a perfectly healthy patient, normal conduction system, and healthy myocardium)