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The human body is a complex and intricate machine that is capable of performing an amazing array of functions on its own without any assistance from others. The brain, which is the control center of the body, processes information, makes decisions, and controls all the voluntary movements of the body. It also regulates various bodily functions such as heart rate, blood pressure, breathing, digestion, and many other vital functions that keep us alive. The heart pumps blood throughout the body, supplying oxygen and nutrients to all parts of the body. The lungs breathe in oxygen and exhale carbon dioxide, which is then removed from the body through the exhalation process. The liver filters out toxins and waste products from the blood, while the kidneys filter out excess fluids and waste products. The muscles of the human body are made up of three types: skeletal muscle, smooth muscle, and cardiac muscle. Skeletal muscle allows for voluntary movement, such as walking, running, or lifting a heavy object. Smooth muscle is found in the walls of hollow organs, such as the stomach and intestines, and helps to move food through the digestive system. The skin protects the body from external harm by forming a barrier against bacteria, viruses, and other foreign substances that can enter the body through cuts or abrasions. It also regulates body temperature by sweating when it is hot and shivering when it is cold.