Signals are transmitted from one neuron to the next neuron, by molecules. These statements are about this process: 1. Transmitter molecules are formed in the receptors. 2. The signal is transmitted across the synapse by osmosis. 3. Transmitter molecules are automatically released once the signal has been transmitted across the synapse. 4. The release of transmitter molecules is triggered by an impulse. 5. The signal is transmitted across the synapse by diffusion. Which of the above statements are correct? A) 1 and 2 B) 1 and 3 C) 2 and 4 D) 3 and 4 E) 4 and 5
Question
Signals are transmitted from one neuron to the next neuron, by molecules. These statements are about this process:
- Transmitter molecules are formed in the receptors.
- The signal is transmitted across the synapse by osmosis.
- Transmitter molecules are automatically released once the signal has been transmitted across the synapse.
- The release of transmitter molecules is triggered by an impulse.
- The signal is transmitted across the synapse by diffusion.
Which of the above statements are correct?
A) 1 and 2 B) 1 and 3 C) 2 and 4 D) 3 and 4 E) 4 and 5
Solution
The correct answer is E) 4 and 5.
Here's why:
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Transmitter molecules are not formed in the receptors. They are synthesized in the neuron and stored in vesicles at the axon terminal.
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The signal is not transmitted across the synapse by osmosis. Osmosis refers to the movement of water molecules, not the transmission of neural signals.
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Transmitter molecules are not automatically released once the signal has been transmitted across the synapse. They are released into the synapse in response to an electrical impulse, and then they bind to receptors on the next neuron to transmit the signal.
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The release of transmitter molecules is indeed triggered by an impulse. When an electrical impulse reaches the end of the neuron, it triggers the release of the transmitter molecules from their vesicles into the synapse.
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The signal is indeed transmitted across the synapse by diffusion. After being released from the neuron, the transmitter molecules diffuse across the synapse to the next neuron, where they bind to receptors and transmit the signal.
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