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8 Μαΐ 2013 · 1) Nerve impulses propagate along axons via the movement of sodium and potassium ions across the axon membrane. 2) At rest, the axon maintains a negative charge due to higher concentrations of potassium and organic ions inside the axon and higher concentrations of sodium and chloride ions outside.
2 Δεκ 2017 · Neurons can be classified based on their number of poles (unipolar, bipolar, multipolar), length of axons, or their function (sensory, motor, interneurons). Myelin allows faster signal transmission along axons. Neurons are the basic structural and functional units of the nervous system.
II. Cellular Structure A. Neurons – structural and functional unit 1. Cell Body – cytoplasm and most organelles 2. Dendrites – short, highly branched, bring in info 3. Axons – long, sends impulse away from cell body a. Axon Terminal – releases neurotransmitters (chemical signals for the next cell)
10 Μαρ 2015 · This document describes the key parts and functions of a neuron. It discusses the soma, dendrites, axon and myelin sheath. The soma contains organelles and extends into dendrites and an axon.
Neurotransmitter is released from vesicles within the axon terminal; Neurotransmitter molecules diffuse across the synapse; Neurotransmitters bind to receptors in the membrane of the next neuron;...
the axonal region is specialized to deliver information. Communication by neurons is based on changes in the membrane’s permeability to ions. Two types of membrane potentials are of major functional significance: graded potentials and action potentials. Chapter 6 Neuronal Signaling and the Structure of the Nervous System
2 ημέρες πριν · Published Oct 23, 2024. Axon terminals are essential components of the nervous system, serving as the final destination for electrical signals traveling along neurons. These structures play a role in communication between nerve cells and their targets, influencing everything from muscle contractions to thought processes.
