Bio 201 exam 3 Rio salado QUESTIONS WITH CORRECT ANSWERS A+ GRADED, Exams of Nursing

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Bio 201 exam 3 Rio salado

action potential can be generated by virtually all cells of the body because all cells possess cell membranes - ✔✔false, only cells with excitable membranes such as nervous and muscle cells can generate action potential Nodes of Ranvier are only found on myelinated, peripheral neural processes - ✔✔true efferent nerve fibers may be described as motor nerve fibers - ✔✔true a positive feedback cycle is the main force in the generation of graded potentials at receptor ends - ✔✔false, positive feedback occurs after depolarization begins a graded potential that is the result of a neurotransmitter released into the synapse between 2 neurons is called postsynaptic potential - ✔✔true in myelinated axons the voltage gates sodium channels are concentrated at the nodes of ranvier - ✔✔true the 2 major classes of graded potential are transmitter potential and receptor potential - ✔✔false, they are generator potentials and post synaptic potentials if bacteria invaded the CNS tissue, microglia would migrate to the area to engulf and destroy them - ✔✔true myelination of the nerve fibers in the central nervous system is the jo. of the obligodendrocytes - ✔✔true neurons in the CNS are organized into functional groups - ✔✔true reflexes are rapid, automatic responses to stimuli - ✔✔true

large diameter nerve fibers conduct impulses much faster than small diameter fibers - ✔✔true During depolarization, the inside of the neuron's membrane becomes less negative. - ✔✔true the obligodendrocytes can myelinate several axons - ✔✔true sensory neurons have long dendrites, while motor neurons have long axons - ✔✔true enkephalins and endorphins are peptides that act morphine - ✔✔true a stimulus traveling toward a synapse to open calcium channels at the pre synaptic end, which in turn promotes fusion of synaptic vesicles to the axonal membrane - ✔✔true saltatory conduction occurs because of the presence of salt (NaCl) around the neuron - ✔✔false, this is signal jumping from nose to node along the axon neurons that are far away from the center of the neuron pool and that are not easily excitable by an incoming stimulus are in the discharge zone - ✔✔false, the periphery of the pool is the facilitated zone acetylcholine is not a biogenic amine - ✔✔true a synapse formed between the axonal ending of 1 neuron and the cell body of another neuron is called an automatic synapse - ✔✔true voltage is always measured between 2 points and may be called the potential between these 2 points - ✔✔true