Question

In blood clotting, the platelets __________ to initiate the clotting process.

Answer 1

the process of clotting involves a series of complex reactions where the soluble blood protein is converted into a mass of tangled threads of soluble proteins

Step-by-step explanation:

When a blood vessel is injured and platelets are exposed to air they rupture releasing thromboplastin also called enzyme thrombokinase which neutralizes heparin which is an anticlotting factor and and activates conversion of prothrombin to thrombin.

This process requires calcium ions and vitamin K. thrombin activates the conversion of the soluble blood plasma protein fibrinogen to its insoluble form fibrin .

Fibrin forms a meshwork of fibers on the cut surface trapping red blood cells to form a meshwork.

Answer 2

The correct answer is - cytoplasmic granules.

Explanation:

Blood clotting or coagulation is a process in which platelets and proteins present in the blood plasma combined act to prevent excessive blood loss from the site of injury.

The cytoplasmic platelets release cytoplasmic granules that contain serotonin, ADP, and thromboxane and platelet factor 4.

There are more content in these granules such as vWF that helps in activating additional platelets that ultimately plug the site of injury and stops bleeding.

Thus, the correct answer is - cytoplasmic granules.