Identify the difference between preload and afterload.
A) Preload is the force (force of ventricular contraction) that the heart must generate in order to overcome vascular resistance (open the aortic valve) and eject blood out of the left ventricle. Afterload is the amount of blood returning to the heart (venous return) .
B) Preload is the force (force of atrial contraction) that the heart must generate in order to eject blood out of the right ventricle. Afterload is the amount of blood ejected by the left ventricle.
C) Preload is the amount of blood returning to the heart (venous return) . Afterload is the force (force of ventricular contraction) that the heart must generate in order to overcome vascular resistance (open the aortic valve) and eject blood out of the left ventricle.
D) None of the above are correct.
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