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← Nature & AnimalsWhich outcome aids successful nocturnal bird migration that relies on star position?
A)Melatonin suppression in optic tectum✓
B)Up-regulation of hippocampus volume
C)Increased rhodopsin production rates
D)Down-regulation of immune system vigilance
💡 Explanation
A functional avian magnetic sense requires melanopsin signaling within ipRGCs; blocking melatonin enhances light sensitivity because suppressing melatonin production fine-tunes the sensitivity, therefore enhancing the star map reading, rather than increased memory or immune suppression.
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