PS101 Chapter Notes - Chapter 4: Adult Stem Cell, Tachycardia, Peripheral Nervous System
Document Summary
Chapter 4- the brain: source of mind and self. Communication in the nervous system: nervous system made up of . Neurons: cells that conduct electrochemical signals; basic unit of nervous system. Glia: cells that support, nurture and insulate neurons, remove debris when neurons die, enhance formation and maintenance of neural connections, and modify neural function. Structure of the neuron: approximately 100 billion neurons in the brain. Branch like fibres that receive information from other neurons and transmit towards cell body. Keeps neuron alive and plays key role in determining whether neuron will fire . Extending fibre that conducts impulse away from cell body and transmits to other cells. Many axons insulated by surrounding layer of fatty material. In cns, this is made up of glial cells. Constrictions in covering nodes divide myelin into segments. Purpose to speed conduction of neural impulses and prevent interference from neighboring signals: neurogenesis: production of new neurons from immature stem cells, stem cells :
