BIO_SC 2300 Study Guide - Final Guide: Dendritic Spine, Wild Type, Shinya Yamanaka
Document Summary
Inactivation is the key reason why ap has refractory periods and why ap only travels in one direction once it has started. What evidence did scientist (katz) suggest the synaptic. 1. ) when they recorded from nerve terminal in muscles they were able to observe the. Majority of the time nothing happens (probability event) (0 mv) Stimulated second time saw small ap (0. 5 mv) Stimulated third time saw ap 2x big (1 mv) Stimulated fourth time and saw something 3x as big (1. 5 mv) Invertebrate animals use large axons to send aps. Most axons have friends from glial cells (ex. schwann cells) Thinner axons to get ap down the axon asap. Evolution offers us similar mechanism to reach same goal (propagating our ap asap) The myelin sheath acts like an electrical insulator surrounding the axon. Axon has no leakage so ap is able to continue to propagate. Mylenated sheath around axon leaves opening mylenated sheath around axon etc.
