BIOL 469 Chapter 2: Nerve Cells, Neural Circuitry and Behavior part 3
Document Summary
Have long, fine processes that contain large bundles of tightly packed intermediate filaments. 4 ways of supporting neurons (cid:12254) (cid:12254) (cid:12254) (cid:12254) Separate cells where it can insults neuronal groups and synaptic connections from each other. Help regulate k+ concentration in the space b/w neurons. K+ to maintain the efficiency of signaling b/w neurons. Perform housekeeping chores to promote efficient signaling b/w neurons. Help nourish surrounding neurons by releasing growth factors. Form myelin sheath that insulates an axon by tightly winding their membranous processes around the axon in a spiral. Myelination; influence axons by enhancing signal conduction and by segregating voltage-sensitive ion channels into distinct axonal domains (nodes of ranvier) Reflex starts when a transient imbalance if the body stretches the quads and extensor muscles of the leg. Mechanism important b/c it continuously maintains normal tone in the quads and prevents our knees from buckling when we stand or walk. 4 types of info from stretch reflex (cid:12254) (cid:12254) (cid:12254)
