In this work. a novel mock circulatory loop (MCL) is presented that is capable of simulating both healthy cardiac function and Heart Failure with preserved Ejection Fraction (HFpEF). This MCL differs from others presented in the literature as it features two independently actuated heart chambers. representing the left atrium and the left ventricle. https://parisnaturalfoodes.shop/product-category/strawberry-vanilla-lip-balm/