Bone formation is impossible without _____ *
Answers
Answer:
Bone
Bones are made of a combination of compact bone tissue for strength and spongy bone tissue for compression in response to stresses.
LEARNING OBJECTIVES
Distinguish between compact and spongy bone tissues
KEY TAKEAWAYS
Key Points
Compact bone is the hard external layer of all bones that protects, strengthens, and surrounds the medullary cavity filled with marrow.
Cylindrical structures, called osteons, are aligned along lines of the greatest stress to the bone in order to resist bending or fracturing.
Spongy or cancellous bone tissue consists of trabeculae that are arranged as rods or plates with red bone marrow in between.
Spongy bone is prominent in regions where the bone is less dense and at the ends of long bones where the bone has to be more compressible due to stresses that arrive from many directions.
Key Terms
trabecula: a small mineralized spicule that forms a network in spongy bone
epiphysis: the rounded end of any long bone
osteocyte: a mature bone cell involved with the maintenance of bone
osteon: any of the central canals and surrounding bony layers found in compact bone