Ch 10 CWP Terms Practice Quiz

Ch 10 CWP Terms Practice Quiz - Ch 10 CWP Terms Practice...

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Ch 10 CWP Terms Practice Quiz applies to neurons located in the central nervous system (CNS) that project their axons outside the CNS and directly or indirectly control muscles. It is often synonymous with efferent neuron. Impulses leaving on a neuron of a neuronal pool often exhibit ___ by passing into several other output fibers. consisting of an absolute and relative phase. In the absolute phase, the Na+ channels cannot be opened by a stimulus; they have entered an inactivated state. This is time-dependent, and during this phase no action potential, irrespective of applied voltage, will be fired. In the relative phase (immediately after the absolute phase), action potentials can be initiated, but the threshold is greater. Neurons within the central nervous system that are organized into groups non-neuronal cells that provide support and nutrition, maintain homeostasis, form myelin, and participate in signal transmission in the nervous system. They surround neurons and hold them in place, to supply nutrients and oxygen to neurons, insulate one neuron from another, and destroy pathogens and remove dead neurons. Several vertebrate axons are surrounded by a myelin sheath allowing rapid and efficient saltatory propagation of action potentials. The contacts between neurons and glial cells display a very high level of spatial and temporal organization in myelinated fibers. The oligodendrocytes in the central nervous system (CNS) and Schwann cells in the peripheral nervous system (PNS), are wrapped around the axon, leaving the axolemma relatively uncovered at regularly spaced intervals at the ___ . a type of neuron with dendrite and axon emerging from same process. a single neurite, round body and with different segments that serve as superficial receptors or terminals. They are more common in the nervous system of the invertebrates, or premature embryos. In adult humans, they are found always in dorsal root ganglia. Enzyme catalyzing breakdown of several biogenic amines, such as serotonin, adrenaline, noradrenaline, dopamine. the interface where the membranes of the two cells flank each other across a slender gap. The narrowness of the gap (20-40 nm) enables signaling molecules known as neurotransmitters to pass rapidly from one cell to the other by diffusion. A structure that recognizes a stimulus in the internal or external environment of an organism. In response to stimuli it initiates sensory transduction by creating graded potentials or action potentials in the same cell or in an adjacent one. It may be a specialized portion of the plasma membrane, a whole cell associated with a neuron ending, or a group of such cells. A neurotransmitter that is not reabsorbed by the pre-synaptic neuron or broken down into a metabolite. They end up spending a significant amount of time in the CSF (cerebrospinal fluid) and influencing (or modulating) the overall activity level of the brain. For this reason, a neurotransmitter may also considered as a ___. Example of this category is serotonin.
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Ch 10 CWP Terms Practice Quiz - Ch 10 CWP Terms Practice...

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