Which of the following best explains how platelets enter the blood? they form in the blood itself as it passes through the lungs. they are formed in the spleen and are released directly into the blood. they are passed through the wall of a bone marrow capillary. they are formed in and released by the thymus.

Platelets are passed through the walls of the bone marrow capillary to the blood.

Explanation:

Platelets can be described as fragments from the cytoplasm which are made from the megakaryocytes taken from the bone marrow.  From the bone marrow, they enter directly into blood.

The function of platelets is majorly in blood clotting. Platelets form clumps at the site of blood vessel injury hence causing a clot to be formed. The life span of the platelets or thrombocytes in the blood is eight to nine days.  Phagocytosis of the old platelets occurs in the liver as well as spleen.

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products

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-lavira : )