BIOL 030 Lecture Notes - Lecture 6: Bone, Osteon, Periosteum
17 Sep 2020
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Document Summary
Bones of the skeleton are organs made of bone tissue, cartilage, marrow, and other tissue types. Layers of bone matrix arranged in circular system = lamellae. Canals run down length of bone and contain blood vessels and nerve. Tree rings" calcified tissue made by osteocytes. Canaliculi: canals radiating from lacuna to neighbour, allow osteocytes to communicate with each other. Periosteum: tough fibrous connective tissue covering whole bone. Layers of bone matrix arranged in delicate struts = trabeculae. Found in heads of long bones and middle of flat bones such as the sternum. Transports cells and dissolved matter (food, waste, oxygen, carbon dioxide) Nervous and muscular tissue are excitable tissues. Membrane potential = electrical difference (voltage) that occurs across a cell membrane. Membrane potential changes due to a stimulus, resulting in a response. Nerve cells rapid transmission of signals to other cells. Nervous tissue: specialized for communication by electrical and chemical signals.
