In your body, you have only two types of bone tissue: cortical and cancellous bone. In this lesson, we will learn about the structure and function of cancellous bone, which plays a crucial role in producing blood cells and stem cells and is the primary tissue affected by osteoporosis.
balaclava (plural balaclavas) 1  A warm cap shielding the neck and head, often made out of wool. ( 2 chiefly Canada) A ski mask with holes for the eyes and, sometimes, the nose and mouth, which may be rolled up and worn like a toque or pulled over the face for greater protection.
Balaclava, Jamaica. Balaclava is a small town in St Elizabeth, Jamaica. Balacalva has a lively, outdoor Market. The St Luke Anglican Church, where many victims of the infamous Kendall Train Crash (1957) are buried, is a historical treasure and museum. Nearby the village of Marlborough Hill offers great scenic walks and tranquility.