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Nervous tissue 2
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Nervous tissue 2

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  • 1. Nervous system 2 Nerve resting potential and impulse action potentials Nerve fibers types and speed of conduction
  • 2. Resting potential Potential for a nerve impulse due to polarized state Relatively negative within nerve -70 mV inside nerve cells due to 3 Na+ ions transported out of cell for every 2 K+ ions transported in to cell
  • 3. Nerve impulse
  • 4. Nerve impulse frequency Limited by rate of Na+ // K+ repolarization Refractory period – neuron cannot generate a new impulse Absolute refractory, 2nd impulse cannot be initiated Relative refractory, 2nd impulse can be initiated with abnormally strong stimulus
  • 5. Speed of nerve impulse conduction Affected by: Temperature Heat increases speed of conduction Cold decreases (or stop) speed of conduction Diameter of fiber; The larger the fiber, the faster the speed of impulse Myelination Myelinated nerves much faster speed of conduction
  • 6. Nerve fiber types Type A Large diameter, myelinated, short refractory and fast conduction (130 m/sec). Motor (efferent) neurons, touch pressure, temp and proprioception (afferent) receptors
  • 7. Nerve fiber types Type B Medium diameter, myelinated, conduction speed not as fast as Type A Smooth muscle and glandular (efferent) innervation and skin and visceral (afferent) receptor
  • 8. Nerve fiber types Type C Small diameter, not myelinated. Longer refractory period Slower speed of conduction Sensory (afferent) from skin and ANS efferent to cardiac and smooth muscle
  • 9. Continuous conduction (slower) Saltatory conduction (faster)