Which ion is involved in the release of Acetylcholine from the pre-synaptic filter into extracellular fluid?
Correct answer: A. Calcium
- A. Calcium
- B. Potassium
- C. Sodium
- D. Magnesium
Explanation
Calcium ions (Ca2+) are involved in the release of neurotransmitters, including acetylcholine, from the presynaptic neuron into the synaptic cleft. When an action potential reaches the presynaptic terminal, it triggers the opening of voltage-gated calcium channels. This influx of calcium ions into the presynaptic terminal leads to the fusion of vesicles containing acetylcholine with the cell membrane and the subsequent release of acetylcholine into the extracellular fluid. The released acetylcholine molecules then bind to receptors on the postsynaptic membrane, initiating a response in the postsynaptic neuron.
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Coordination depends on receptors, neurons, synapses and nerve impulses, with reflex actions traced through the reflex arc and the roles of major brain regions. Chemical coordination covers endocrine glands and hormones, including how hormones regulate growth, metabolism, reproduction and internal balance, unlike rapid nervous control.
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