Bercouli Sword SAO

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The human body has a complex system of organs and tissues that work together to maintain overall health. The nervous system, which includes the brain and spinal cord, plays a crucial role in controlling various bodily functions such as movement, sensation, perception, and cognition. The circulatory system, comprising the heart, arteries, veins, and blood vessels, is responsible for transporting oxygenated blood throughout the body while also removing waste products. The digestive system, consisting of the mouth, esophagus, stomach, small intestine, and large intestine, breaks down food into nutrients that can be absorbed by the body. The immune system, made up of various cells and tissues, defends against pathogens such as bacteria, viruses, and other foreign substances that could harm the body. The respiratory system, consisting of the lungs, trachea, bronchi, and diaphragm, is responsible for bringing oxygen into the body while expelling carbon dioxide. The skeletal system, composed of bones, cartilage, and ligaments, provides structural support and protection for vital organs. The muscular system, comprising voluntary muscles such as those in the arms and legs, as well as involuntary muscles like those found in the digestive tract, enables movement and supports various bodily functions.