<prompt> Cardiac output increases due to:Decrease in intrathoracic pressureDecrease in blood volumeDecreased ventricular complianceDecreased mean systemic filling pressure  <response>: Option A: Thoracic pump: Option B: Decreased blood volume - decreased mean systemic filling pressure Psf-decreased venous return Option C: Decreased ventricular compliance will decrease the ability of ventricle to accumulate blood during diastole - decreased EDV Option D: Decreased filling, decreases EDV Factors maintaining CO: Hea rate chronotropic effect Stroke volume Venous return or EDV or preload Force of contraction inotropic effect determines ESV Afterload, determined by total peripheral resistance TPR 