1. Explain the Frank-Starling law of the heart.

3:33 Cardio 2 Question 2 ... Unanswered Which of these phrases accurately describes Starling's Law? Increased arterial pressure A decreases stroke volume. Increased EDV tends to increase B stroke volume. As heart rate decreases, filling time C and preload both increase. As venous return increases, cardiac sarcomeres stretch and increase the force of contraction. D Sympathetic nervous system stimulation increases the force of ventricular contraction. A Submit

State the electrical status of the atrial and the ventricular contractile muscle fibers (that is, whether they are still at resting potential, completely depolarized, or completely repolarized) during the PR segment, the ST segment, and the TP segment.

The end systolic volume from an individual’s heart was found to be 50 ml, the end diastolic volume was found to be 110 ml and the heart rate was 90 bpm. What is this individual’s stroke volume, ejection fraction and cardiac output (C.O)?   Group of answer choices SV =  60 ml                Ejection Fraction =     50%                 C.O =  3.4  l/min   SV = 110  ml              Ejection Fraction =     52%                 C.O =  4.4  l/min   SV =   60 ml               Ejection Fraction =     55%                 C.O =  5.4  l/min   SV =  160 ml              Ejection Fraction =     70 %                C.O =  6.4  l/min

9. Explain the effects of exercise on each of the following components of an EKG: Why? Increases or Decreasess with Exercise? Duration of RR Interval (time of one heartbeat) Heart Rate (calculated) Duration of P wave Duration of QRS complex Duration of T wave Duration of PR segment Duration of ST segment Duration of TP segment

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4.4. R = R₁ + AR Ro Arterial Compliance: An artery of 1 cm diameter under diastolic pressure increases in diameter by 5% during systole. What is the artery's compliance if BP = 140/90 mmHg? (Use the definition of compliance given in class.)

Predict:  Because of a reduced blood supply to the AV node, the delay in the conduction of action potentials from the SA node to the AV node is increased slightly.  All other areas of the conducting system of the heart are functioning normally.  Predict how this affects the normal rhythm of the heart.