SSC General Science & Technology Sample Paper NCERT Sample Paper-2

  • question_answer
    Once blood clots at a wound, harmful bacteria are prevented from entering by:

    A)  Scab formation

    B)  Exudation of serum

    C)  Antibodies

    D)  Antitoxins released by the blood clot

    Correct Answer: A

    Solution :

    [a] Blood clots play an unexpected role in protecting the body from the deadly effects of bacteria by absorbing bacterial toxins. When your blood clots up, the clot itself is comprised of lots of different blood cells, as well as fibrin, which is a thread-like substance designed to hold the clot together. If your body is doing its job, a scab over your cut will be formed. The purpose of the scab is to protect the wound from harmful bacteria and the elements. Without the scab, your blood would be exposed to the world, and would essentially be a means by which any dangerous and harmful bacteria could enter your body and cause you to have an infection or get sick.

You need to login to perform this action.
You will be redirected in 3 sec spinner