Consider two cells (X and Y) in a reflex arc in the nervous system - VCE - SSCE Biology - Question 10 - 2006 - Paper 1
Question 10
Consider two cells (X and Y) in a reflex arc in the nervous system. Cell X is transmitting a signal to cell Y.
Signal transduction commences
A. in the cytosol of ce... show full transcript
Worked Solution & Example Answer:Consider two cells (X and Y) in a reflex arc in the nervous system - VCE - SSCE Biology - Question 10 - 2006 - Paper 1
Step 1
A. in the cytosol of cell X.
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Answer
While the cytosol of cell X is crucial for various cellular processes, the signal transmission specifically does not occur here. Instead, this area is responsible for metabolic activities and intracellular signaling.
Step 2
B. along the axon of cell X.
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Answer
Although the axon is essential for the propagation of action potentials, the signal transmission starts with the release of neurotransmitters at the synapse rather than strictly along the axon.
Step 3
C. in the myelin sheath of cell X.
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The myelin sheath acts primarily as an insulator for the axon, increasing the speed of signal transmission but is not involved in the initial signaling process.
Step 4
D. at the synapse between cells X and Y.
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Answer
The correct answer is D. At the synapse between cells X and Y, neurotransmitters released by cell X bind to receptors on cell Y, initiating the signaling process. This is the crucial point for communication between the two cells.
