Physiology All of the following factors normally increase the length of the ventricular cardiac muscle fibers, except: A Increased venous tone B Increased total blood volume C Increased negative intrathoracic pressure D Lying-to-standing change in posture 💡 Explanation All of the following factors normally increase the length of the ventricular cardiac muscle fibers, except: ✓ Correct Answer: D. Lying-to-standing change in posture