BMS 300 Exam 2 Walrond(with complete solutions)

kinesin correct answers + directed motor protein Dynein correct answers - directed motor protein where is kinesin synthesized? correct answers cytoplasm (slow transport) where dynein synthesized? correct answers RER (fast transport) Schwann cells correct answers myelinating cells of the PNS - myelinates one axon - able to repair themselves if severed Oligodendrocyes correct answers myelinating cells of the CNS - myelinates many axons - unable to repair themselves Astrocytes correct answers - only in the CNS - control neurotransmitters in the synaptic cleft - convert glutamate to glutamine K+ leak channels function correct answers - determines the resting membrane potential (-70mV) - balanced by electrical gradient due to large anions on inside of cell membrane Na+ voltage gated channels correct answers - influx of Na+ - depolarize the cell membrane - very fast to open and deactivate K+ voltage gated channels correct answers - efflux of K+ - depolarize the cell membrane - slow opening and closing S4 region correct answers - mechanism that causes the Na+ voltage gated channels to open - activated by influx of positive charge capacitance correct answers separation of opposing charges by an uncharged medium - cell membrane is the capacitor Why do myelinated axons carry action potentials faster than unmyelinated axons? correct answers Because of saltatory conduction, the movement of the positive charge between Nodes of Ranvier with the electromagnetic field how myelin affects capacitance correct answers myelin decreases the strength of the capacitance because it increases the distance between opposing charges