RIO BIO 201 Study Guide Questions With Answers

RIO BIO 201 Study Guide Questions With Answers True or False: Action potentials can be generated by virtually all cells of the body because all cells possess cell membranes - Answer- False What cells can generate action potential? - Answer- Excitable membranes, such as neurons and muscle cells True or False: The nodes of Ranvier are found only on myelinated, peripheral neural processes - Answer- True What are the nodes of Ranvier? - Answer- gaps in myelin sheath along the axon True or False: Efferent nerve fibers may be described as motor nerve fibers - Answer- True True or False: A positive feedback cycle is the main force in the generation of graded potentials at receptor ends - Answer- False When does positive feedback occur? - Answer- After depolarization begins True or False: A graded potential that is the result of a neurotransmitter released into the synapse between two neurons is called a postsynaptic potential - Answer- True True or False: In myelinated axons the voltage-gated sodium channels are concentrated at the nodes of Ranvier - Answer- True True of False: The two major classes of graded potentials are transmitter potentials and receptor potentials - Answer- False What are the two major classes of graded potentials? - Answer- Generator potentials and post-synaptic potentials True or False: If bacteria invaded the CNS tissue, microglia would migrate to the area to engulf and destroy them - Answer- True True or False: Myelination of the nerve fibers in the central nervous system is the job of the oligodendrocyte - Answer- True True or False: Neurons in the CNS are organized into functional groups - Answer- True True or False: Reflexes are rapid, automatic responses to stimuli - Answer- True True or False: Large-diameter nerve fibers conduct impulses much faster than small-diameter fibers - Answer- True True or False: During depolarization, the inside of the neuron's membrane becomes less negative - Answer- True True or false: The oligodendrocytes can myelinate several axons - Answer- True What are oligodendrocytes? - Answer- A type of glial cell that forms insulating myelin sheaths around the axons of neurons in the central nervous system.