All of the following factors normally increase the length of the ventricular cardiac muscle fibers except:
D i.e. Lying to standing change in posture When a person moves from a supine position to standing position volume of blood pools in the lower extremity because of high compliance of veins & venous return decreases. As a result of decreased venous return the length of ventricular cardiac muscle fibres is decreasedQ and so the cardiac output in accordance with frank-sterling law.
Increased venous tone.
Increased total blood volume
Increased negative intrathoracic pressure.
Lying-to-standing change in posture