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The human body is a complex and highly adaptable system that consists of an estimated 37 trillion cells, each with its own unique role to play in maintaining overall health and functioning optimally. The human brain, which accounts for only about 2% of the body's total mass, uses approximately 20% of the body's energy expenditure. This highlights the intricate relationship between the central nervous system and other bodily systems. The cardiovascular system is responsible for transporting oxygenated blood to various tissues throughout the body, while also removing waste products through a network of capillaries, arteries, veins, and the heart itself. The human immune system, which includes components such as white blood cells and lymph nodes, plays a vital role in protecting against infections and diseases by identifying foreign invaders and activating an appropriate response to eliminate them.