Blood coagulates to form a blood clot through a complex series of steps involving all of the following substances, EXCEPT ________
A) clotting factors
B) platelets
C) white blood cells
D) thromboplastin
Answer: D
A) Clotting factors are involved in the steps of blood clotting.
B) Platelets are involved in the steps of blood clotting.
D) Thromboplastin is involved in the steps of blood clotting.
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