Multiple Choice
The thymus is most active during which stage of human development?
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10. Cell Signaling
Introduction to Cell Signaling
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Which ion diffuses into the synaptic knob, resulting in the release of a neurotransmitter?
A
Calcium ion (\(\mathrm{Ca^{2+}}\))
B
Sodium ion (\(\mathrm{Na^+}\))
C
Chloride ion (\(\mathrm{Cl^-}\))
D
Potassium ion (\(\mathrm{K^+}\))
Verified step by step guidance1
Step 1: Understand the context of the problem. The synaptic knob is the terminal end of a neuron where neurotransmitters are released into the synaptic cleft to communicate with the next cell.
Step 2: Recall the process of neurotransmitter release. When an action potential reaches the synaptic knob, it triggers the opening of voltage-gated ion channels.
Step 3: Identify the specific ion involved. Voltage-gated calcium channels open, allowing calcium ions (\(\mathrm{Ca^{2+}}\)) to diffuse into the synaptic knob.
Step 4: Explain the role of calcium ions (\(\mathrm{Ca^{2+}}\)). The influx of calcium ions signals vesicles containing neurotransmitters to fuse with the membrane and release their contents into the synaptic cleft.
Step 5: Compare the other ions listed. Sodium ions (\(\mathrm{Na^+}\)), chloride ions (\(\mathrm{Cl^-}\)), and potassium ions (\(\mathrm{K^+}\)) play roles in other cellular processes but are not directly responsible for triggering neurotransmitter release in this context.
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