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What is the effect of increased calcium ion concentration in the presynaptic ter

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Question: What is the effect of increased calcium ion concentration in the presynaptic terminal?

Options:

  1. Inhibition of neurotransmitter release
  2. Promotion of neurotransmitter release
  3. No effect on neurotransmitter release
  4. Degradation of neurotransmitters

Correct Answer: Promotion of neurotransmitter release

Solution: 

Increased calcium ion concentration in the presynaptic terminal triggers the fusion of neurotransmitter-containing vesicles with the membrane, promoting neurotransmitter release.

What is the effect of increased calcium ion concentration in the presynaptic ter

Practice Questions

Q1
What is the effect of increased calcium ion concentration in the presynaptic terminal?
  1. Inhibition of neurotransmitter release
  2. Promotion of neurotransmitter release
  3. No effect on neurotransmitter release
  4. Degradation of neurotransmitters

Questions & Step-by-Step Solutions

What is the effect of increased calcium ion concentration in the presynaptic terminal?
  • Step 1: Calcium ions (Ca2+) enter the presynaptic terminal when a nerve signal arrives.
  • Step 2: The increase in calcium ion concentration inside the presynaptic terminal is detected by proteins.
  • Step 3: These proteins trigger the vesicles that contain neurotransmitters to move towards the membrane.
  • Step 4: The vesicles fuse with the presynaptic membrane due to the action of the proteins.
  • Step 5: Once fused, the vesicles release neurotransmitters into the synaptic cleft (the gap between neurons).
  • Step 6: The released neurotransmitters can then bind to receptors on the postsynaptic neuron, leading to a response.
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