The blood cells that initiate blood clotting are: MCQ with Answer and Explanation

Explanation:
Schwann cells wrap around axons in the PNS to form myelin sheaths. Oligodendrocytes myelinate axons in the CNS. Astrocytes support neurons, microglia are immune cells.

Explanation:
Vitamin K is required for the gamma-carboxylation of prothrombin (factor II) and other clotting factors, enabling them to bind calcium and participate in coagulation. Deficiency leads to bleeding.

Explanation:
Robert Brown, a Scottish botanist, discovered the nucleus in 1831 while studying orchid cells under a microscope. He named it 'nucleus'. Hooke discovered cells, Leeuwenhoek observed living cells, Schleiden proposed that all plants are made of cells. Brown's discovery was crucial for understanding cell structure and function.