Pnb 2xb3: Neuroanatomy Exam Questions (128 Terms) With Verified Definitions Updated 2024

what causes vesicles to release neurotransmitters and how? {Ans: Vesicle release is inhibited when calcium channels are inhibited. When an axon receives an action potential, voltage-gated calcium channels release calcium into the terminal quickly}two most common inhibitory neurotransmitters (where?) {Ans: GABA in the cerebral cortex Glycine in the brainstem/spinal cord}coronal plane {Ans: across division into front and back portions}voltage gated potassium channels {Ans: allow K+ to flow out of the cell, moving the potential back towards the negative equilibrium potential of potassium (slow negative feedback loop)}electrostatic force {Ans: as K+ diffuses out, the inside becomes negative, but then the K+ is attracted to te negative inside REMEMBER: the amount of K+ leaving are negligible. VOLTAGE CHANGES BY CONCENTRATION DOES NOT}(3) States of voltage-gated sodium channels {Ans: closed = at rest open = rising phase inactivated = when the cell is positive, potential is at the peak and the charge is repelled by the positive inside (stops the fast positive feedback loop)}