Chapter 2 - Chapter 2: Neurons Neurons- receive information...

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Chapter 2: Neurons Neurons- receive information and transmit it to other cells Ramon y Cajal used stains to determine that neurons are individual cells with small gaps between them called synapses Cell Structures o Membrane: separates inside from outside with a 2-layers of fat molecules Only small charged ions can actively diffuse to the cell Oxygen, water, CO2, and urea can diffuse passively o Nucleus: contains chromosomes o Mitochondria: metabolizes the cell o Ribosomes: produces proteins o Endoplasmic Reticulum: sends off proteins o Dendrites: branching fibers; Receiver of information o Dendritic Spines: increases surface area for the reception of signals o Soma: cell body; covered in synapses o Axon: thin fiber that Sends information away from the cell o Myelin Sheath: insulating material o Nodes of Ranvier: boosts action potential (SALTATORY CONDUCTION) o Presynaptic Terminals: point where axon releases neurotransmitters Motor Neurons: has its soma in the spinal cord. Receives excitation from other neurons
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Chapter 2 - Chapter 2: Neurons Neurons- receive information...

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