AGRC1020 Lecture 8: AGRC1020 Lecture 8, Connective, Muscle, Neural Tissue
30 Jul 2018
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Intramembrous ossification: within tissues to form flat bone, endochondral ossification, cartilage cells becoming bone cells at growing plates, appositional growth, thickening of bones. Bone composition: bone is made up of a framework of collagen fibres, bone cells and inorganic calcium salts, collagen fibres, account for 1/3 bone weight, very strong, very flexible. Dynamic bones: made and destroyed depending on, exercise, calcium levels, phosphorus levels, hormones. Excitable tissue that can contract to produce force and movement. Excitable cells that carry electrical signals to transmit messages within the nervous system. 2 types of cells: neurons, glial cells/neuroglia: Anatomically divided: cns (brain and spinal cord, pns (all neural tissue outside cns) Includes all neurons of the somatic nervous system and effectors of the ans. Interneurons: connectors, most common type of neuron, more complex the response = more interneurons. The brain: surrounded by cell tissues meninges, cells are laid down in layers, fluid which fills the ventricles produced in the choroid plexus.
