9808 Lecture Notes - Lecture 4: Bone Marrow, Dense Irregular Connective Tissue, Sesamoid Bone

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A bone is made up of bone tissue, cartilage, dense connective tissue, epithelium, adipose tissue and nervous tissue. The entire framework and cartilages constitutes the skeletal system. Support : the skeleton supports soft tissue and provides attachment points for the tendons. Protection : the skeleton protects the most important international organs from injury (the cranial bones protect the brain, the rib cage protects the heart and lungs. Assistance in movement : most muscles attach to bones, when they contract they pull on bones to produce movement. Mineral homeostasis : bone tissue makes up about 18% of the weight of the human body. It stores several minerals, especially calcium and phosphorus, which contribute to the strength of bone. Bone tissue stores about 99% of the body"s calcium. On demand, bone releases minerals into the blood to maintain homeostasis. Blood cell production : within certain bones, a connective tissue called red bone marrow produces red blood cells, white blood cells, and platelets.

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