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Nana76 [90]
3 years ago
5

The transmissive segment is the axon hillock. The main activity that occurs at the transmissive segment is the release of neurot

ransmitter from ____________ . Prior to the arrival of the action potential, ____________ embedded in the plasma membrane of a synaptic knob establish a ____________ concentration gradient by pumping it out to the IF. Consequently, there is more calcium ____________ of the synaptic knob than ____________ it.
Biology
1 answer:
bogdanovich [222]3 years ago
3 0

Explanation:

The main activity that occurs at the transmissive segment is the release of neurotransmitter from <u>synaptic vesicles</u> . Prior to the arrival of the action potential, <u>Ca2+ pumps</u> embedded in the plasma membrane of a synaptic knob establish a <u>calcium</u> concentration gradient by pumping it out to the IF. Consequently, there is more calcium <u>inside </u>of the synaptic knob than <u>outside</u> it.

Further Explanation:

At synaptic junctions:

  • The action potential travels along the membrane until the synapse where it’s electrical depolarization leads to the opening of channels allowing Ca2+ to rush into the terminal due to higher extracellular concentrations
  • these flow through a presynaptic membrane until the concentration is built up, activating ion sensitive proteins attached to vesicles containing neurotransmitters
  • this leads to changes in the proteins leading to the fusion with the membrane of the presynaptic cell, so vesicles are open and neurotransmitter is released. The neurotransmitter diffuses across to chemical receptors on the presynaptic cell where they bind temporarily
  • This leads to activation of specific complexes, enabling the transmission of information. Thus, the chemical signal is transferred through this neuron as an electrical impulse

Learn more about the autonomic nervous system at brainly.com/question/10386413

Learn more about neurotransmitters at brainly.com/question/9424160

Learn more about homeostasis at brainly.com/question/1601808

#LearnWithBrainly

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