Why is the flu deadly

Flu can directly lead to death when the virus triggers severe inflammation in the lungs. When this happens, it can cause rapid respiratory failure because your lungs can't transport enough oxygen into the rest of your body. The flu can also cause your brain, heart, or muscles to become inflamed. Also, the Flu virus infection of the respiratory tract can trigger an extreme inflammatory response in the body and can lead to sepsis, the body's life-threatening response to an infection. Flu also can make chronic medical problems worse.

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Explanation:

after a the power stroke, adp is released, but the cross-bridge formed is still in place. atp then binds to myosin, moving the myosin to its high-energy state, releasing the myosin head from the actin active site.