Question

Precursors of platelets are called

A. reticulocytes.
B. phagocytes.
C. monocytes.
D. megakaryocytes.
E. nongranular leukocytes.

Answer 1

Megakaryocytes are the precursors of platelets and are responsible for their production in the bone marrow.

Step-by-step explanation:

The precursors of platelets are called megakaryocytes. These are large cells found in the bone marrow that release platelets into the bloodstream. Platelets are essential for blood clotting and are actually cytoplasmic fragments of megakaryocytes surrounded by plasma membrane.

Myeloid stem cells give rise to megakaryocytes which, upon maturing, extend platelet-precursor extensions through the walls of bone marrow capillaries to release platelets.

As each megakaryocyte can release thousands of platelets, they play a crucial role in maintaining adequate levels of platelets for hemostasis.

Answer 2

Megakaryocytes are the precursors of platelets, arising from myeloid stem cells and releasing thousands of platelets into the bloodstream.

Step-by-step explanation:

The precursors of platelets are called megakaryocytes. Megakaryocytes originate from myeloid stem cells and are large cells with an enlarged, lobed nucleus. They stay within the bone marrow and release platelets into the circulation through cytoplasmic extensions. Each megakaryocyte can release between 2000 to 3000 platelets during its lifespan before being consumed by macrophages.

Precursors of platelets are called megakaryocytes. Platelets, also known as thrombocytes, are not cells but rather fragments of cytoplasm from megakaryocytes. These fragments are released into the bloodstream and are essential for hemostasis.