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The human body is a complex and highly adaptable machine that has been engineered by thousands of years of evolution to withstand incredible stresses and pressures. Its internal systems are constantly working together to maintain homeostasis and keep us alive, even when we're pushed to our limits. The human heart beats around 3 billion times in an average lifetime, pumping over 1.5 million barrels of blood - enough to fill a train tank with its contents. Meanwhile, the lungs inhale and exhale around 17,000 breaths per day, exchanging oxygen and carbon dioxide through tiny air sacs called alveoli. The brain is a remarkable organ that processes vast amounts of information every second, using electrical impulses to transmit signals across billions of neurons. It's estimated that the human brain contains over 100 billion neurons, each one connected to thousands of others in a complex network that allows us to think, learn and remember.