An organ is formed by two or more tissues that carries out a particular ranges of tasks. Important organs inside the human body include: heart, lungs, brain, spinal cord, liver, kidneys, and stomach.

器官由兩種或以上共同負起一系列任務的組織構成。人體內重要的器官包括：心、肺、腦、脊髓、肝、腎和胃等。