BIO 208 Lecture Notes - Lecture 22: Medullary Cavity, Bone, Epiphysis
Document Summary
Q1: what part of the bone is most likely involved with stem cell manufacture of wbcs? a- diaphysis, b- epiphysis, c-red bone marrow, d-yellow or white bone marrow, e-periosteum. Expanded ends, made of both bone types. Yellow marrow: fat storage (can revert to bc production) Located on exterior surface of bones for protection. Bones with high proportion of c. b. have limited force direction, strong when stress along axis of alignment: spongy (cancellous) bone: Network of struts with spaces for marrow (trabeculae) Located in interior of bones and high propor of sb in bones with multidirectional forces low forces. Trabeculae oriented along stress lines with extensive cross bracing (at joints transfer lateral stress: relative amounts of each varies with bone type (long vs. at) Composition of bone: matrix, ground substance: mostly calcium phosphate. Amorphous, loosely bound (incorporate other salts and ions. Good compression but shatter with linear force: collagen fibers- good for twisting and limited linear force, cells: 2% by weight.
