• Card 21 / 28: The heart becomes ____________ efficient in the interactions between the myofibrils in the sarcomeres and has an __________________in demand for energy. This would explain why dilaton could lead to heart failure.
    A) more, decrease
    B) more, increase
    C) less, increase
    D) less, decrease

    Answer:
    C) less, increase

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Explanation:

If sarcomeres are stretched, the actin / myosin interactions are compromised and finally stretched so far apart they completely dissociated and don't interact at all. This makes heart less efficient.

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