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Q. How does synaptic transmission between neurons take place?
The propagation of the action potential along the axon reaches the region immediately anterior to the presynaptic membrane causing its permeability to calcium ions to change and these ions to enter the cell in the presynaptic area of the axon there are many neurotransmitter-repleted vesicles that by means of exocytosis activated by the calcium influx release the neurotransmitters into the synaptic cleft. The neurotransmitters then bind to specific receptors of the postsynaptic membrane the binding of neurotransmitters to their receptors is reversible that is the neurotransmitters are not consumed after the process. With the binding of neurotransmitters to the postsynaptic receptors the permeability of the postsynaptic membrane is depolarization and the altered that will lead to the first action potential of the postsynaptic cell begins.
Q. What are the main phases and clinical manifestations of schistosomiasis? The Schistosomiasis has acute and chronic phases and Days after the infection the cercarial dermatit
CAUSE S OF VARIATION - Effect of environmental conditions Change in the gene pattern like - (a) Random distribution of homologous genes in meiosis (b) Crossing over
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How is heart contraction triggered? Heart contraction is independent from neuronal stimulus (although it can be modulated by the autonomous nervous system). In the heart there
The atomic number of the isotope 238U of uranium is 92. The nucleus of this isotope contains a) 184 protons, 92 electrons, and 54 neutrons. b) 92 protons and 146 neutrons. c) 92 pr
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explain why expired air contain co2
Q. What is the kind of life cycle present in pteridophytes? Like all plants pteridophytes present diplobiontic (alternation of metagenesis or generations,) life cycle.
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