In normal humans,the time taken for normal blood clotting is:

  • A
    $5-25\; min$
  • B
    $30-50\; min$
  • C
    $4-10\; min$
  • D
    Few seconds

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What is the study of the circulatory system called?

Consider the following four statements regarding the human circulatory system:
$(a)$ Arteries have thick walls and have a smaller lumen compared to veins.
$(b)$ Angina is a sudden chest pain.
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