Friday 17th October 2025
    Difficulty: Hard

    The human body (Quiz #1,064)

    Photo by <a href="https://unsplash.com/@taylor_friehl?utm_content=creditCopyText&utm_medium=referral&utm_source=unsplash">Taylor Friehl</a>
    Photo by Taylor Friehl (Unsplash)

    1. Roughly how much body heat is lost through your head?

    2. How long would a single adult's blood vessels be, if they were laid end to end?

    3. How many times does a human heart beat in an average life span?

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