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 synapses- a 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 semi- permeable 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.