Which organ system is responsible for transporting oxygen throughout the body?

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The circulatory system is the organ system consisting of blood, blood vessels, and the heart. It is responsible for transporting oxygen (via blood) throughout the body.
The integumetary system is the organ system consisting of hair, skin, and nails and is responsible for protecting the body and regulating body temperature.
The endocrine system is the organ system that is a collection of glands that produce hormones that regulate metabolism, growth and development, tissue function, sexual function, reproduction, sleep, and mood. These glands include the hypothalamus, pituitary, thyroid, parathyroids, adrenals, pineal body, ovaries, and testes.
The lymphatic system is the organ system consisting of the lymph nodes, spleen, and thymus, as well as the lymphatic tissue found in the small intestine (Peyer's patches) and throat (adenoid tonsils, palatine and tubal tonsils). The lymphatic system's purpose is to rid the body of toxins, waste and other unwanted materials.

Which Organ System Is Responsible for Transporting Oxygen Throughout the Body