Changes

* ''Structural zone'' contains microtubules and actin and myosin filaments

* ''Structural zone'' contains microtubules and actin and myosin filaments

* ''Organelle zone'' contains organelles such as mitochondria along with three different granule types

* ''Organelle zone'' contains organelles such as mitochondria along with three different granule types

* ''Membrane zone'' is made of two types of membrane. One, the open canicular system, is membrane not used when the platelet budded off the megakaryocyte. The other, the dense tubular system, is membrane from the rough endoplasmic reticulum and is involved in calcium ion storage and regulation.

* ''Membrane zone'' is made of of two types of membrane. One, the open canicular system, is membrane not used when the platelet budded off the megakaryocyte. The other, the dense tubular system, is membrane from the rough endoplasmic reticulum and is involved in calcium ion storage and regulation.

<p>Reptilian thrombocytes are ellipsoidal to fusiform shaped with an elliptical, centrally positioned nucleus. They are similar in function to mammalian platelets and are involved in thrombus formation, blood clotting and wound healing.

<p>Reptilian thrombocytes are ellipsoidal to fusiform shaped with an elliptical, centrally positioned nucleus. They are similar in function to mammalian platelets and are involved in thrombus formation, blood clotting and wound healing.

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