Work out the number

Exercise and reference answers

Questions

1. Hint

   CO = HR x SV, then convert mL to L

   Unit

   L/min

   Answer

   5.25

   Question

   Resting stroke volume is about 70 mL and heart rate is about 75 bpm. What is the cardiac output in L/min?

2. Unit

   mL

   Answer

   60

   Question

   If EDV is 130 mL and stroke volume is 70 mL, what is the end systolic volume in mL?

3. Unit

   bpm

   Answer

   40

   Question

   Without the SA node, the AV node paces the heart at about how many beats per minute (lower end of its range)?

4. Unit

   %

   Answer

   20

   Question

   About what percent of ventricular filling comes from atrial contraction (the atrial kick)?

5. Unit

   ms

   Answer

   50

   Question

   About how many milliseconds does the impulse take to travel from the SA node to the AV node?

Instructions

Work out the answer and key it in.