The stroma is the central location of light-independent reactions

Stroma is a big main carrier of a chloroplast that is fluid full and contains enzymes that is used in photosynthesis it uses the products of the light dependent reactions to reduce carbon dioxide to a carbohydrate. In stroma light – independent synthesis portion of photosynthesis takes place and does not directly require solar energy; 

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blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.