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Transcript
Motor Neuron By Katelynn Morris Structures of the Motor Neuron • Cell body (biosynthetic center) • Nucleus • Nucleolus • Nissl bodies is used to localize the perikaryon • Axon hillock • Axon (impulse generating and conducting region) Structures continued • Neurilemma (sheath of schwann) • • • • • Impulse direction Schwann cell (one internode) Node of ranvier Telodendria (terminal branches) Axonal terminal Functions of the Motor Neuron • The cell body delivers signals from other parts of the organism. • The nucleus are organized as DNA molecules with a large variety of proteins to form chromosomes. • The nucleolus is located in the nucleus and makes Ribosomal RNA. • Nissl bodies are used to localize the perikaryon. Functions of the Motor Neuron • Axon hillock is part of the neuron that connects the cell body to the axon. • the axon conducts electrical impulses away from the neuron's cell body. • Neurilemma surrounds the axon of the neuron and forms the outermost layer of the nerve fiber. • Impulse direction can only go one direction and it sends the impulse from one neuron to another. Functions of the Motor Neuron • Schwann cell are the supporting cells of the PNS, they wrap themselves around nerve axons. • Node of ranvier are the gaps formed between the schwann cell generated by different cells. • Telodendria is the terminal branches of an axon; makes contact with other neurons at synapsesa neural junction used for communication between neurons. • Axonal terminal conducts electrical impulses away from the neuron's cell body to transmit those impulses to other neurons. Osmosis • Osmosis is the diffusion of water through a semipermeable membrane. • When materials move into and out of a cell at equal rates, the cell is balanced, or in dynamic equilibrium. An isotonic solution has a concentration of materials the same as the inside of a cell. If a cell is placed in an isotonic solution, molecules will still move into and out of the cell, but the cell will be in dynamic equilibrium. If a substance is in lower concentration outside a cell than inside the cell, the substance will leave the cell through osmosis. Diffusion • Diffusion is the process where molecules spread from areas of high concentration, to areas of low concentration. • All molecules and particles that are in an area of higher concentration in a gas or liquid will tend to move to an area of lower concentration. Cellular Respiration • Cellular respiration is the process of oxidizing food molecules, like glucose, to carbon dioxide and water. The energy released is trapped in the form of ATP ( a nucleotide that performs many roles in the cell.) for use by all energy.