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  1. Asked: November 24, 2020In: Class 7 Science

    Why do we often sneeze when we inhale a lot of dust-laden air?

    Badrinath
    Added an answer on November 24, 2020 at 5:49 am

    When dust particles enter our nostril, it triggers a message to the brain. The brain instructs the nasal chamber to initiate sneezing. This is a method to remove the unwanted dust particles from the nostrils. Sneezing is a type of defence mechanism used by our body. https://www.tiwariacademy.com/nceRead more

    When dust particles enter our nostril, it triggers a message to the brain. The brain instructs the nasal chamber to initiate sneezing. This is a method to remove the unwanted dust particles from the nostrils. Sneezing is a type of defence mechanism used by our body.

    https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-10/

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  2. Asked: November 24, 2020In: Class 7 Science

    Why does an athlete breathe faster and deeper than usual after finishing the race?

    Badrinath
    Added an answer on November 24, 2020 at 5:47 am

    When the athlete runs in the race, his body needs more energy. In order to get extra energy, the athlete breathes faster. Because more oxygen is supplied to our cells. It speeds up the breakdown of food and more energy is released. https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapteRead more

    When the athlete runs in the race, his body needs more energy. In order to get extra energy, the athlete breathes faster. Because more oxygen is supplied to our cells. It speeds up the breakdown of food and more energy is released.

    https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-10/

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