Which chamber of human heart pumps fully oxygenated blood to aorta and thence to the body ?

The human heart is a four-chambered muscular organ where the left side is responsible for systemic circulation. Oxygenated blood returns from the lungs via the pulmonary veins and enters the left atrium [t2][t4]. From the left atrium, the blood is transferred to the left ventricle [c1]. The left ventricle is the most muscular chamber because it must generate high pressure to pump blood throughout the entire body [c1][t7]. When the left ventricle contracts, it ejects fully oxygenated blood into the aorta, the body's largest artery, which then distributes it to various organs and tissues [t1][t2][t8]. In contrast, the right side of the heart handles deoxygenated blood, with the right ventricle specifically pumping it to the lungs for re-oxygenation [c1][t5]. Therefore, the left ventricle is the specific chamber that pumps oxygenated blood to the aorta and the rest of the body.

Sources

1. [1] Science , class X (NCERT 2025 ed.) > Chapter 5: Life Processes > Our pump — the heart > p. 92
2. [2] https://www.betterhealth.vic.gov.au/health/conditionsandtreatments/circulatory-system
3. [3] https://training.seer.cancer.gov/anatomy/cardiovascular/heart/structure.html