Which consequence results when a fish's efferent blood vessel constricts near gill lamellae during high activity?

💡 Explanation

When afferent blood vessels constrict, countercurrent exchange weakens because blood velocity increases, reducing the equilibrium time across the diffusion gradient. Therefore reduced oxygen extraction results, rather than higher carbon dioxide elimination, pH change, or ammonia diffusion which require differing metabolic adjustments.

• Which outcome occurs when soaring bird surface contour feathers become contaminated with oil?
• Which outcome occurs when avian migratory cues misalign during twilight?
• Which consequence results when a vascular plant experiences negative pressure gradients surpassing cavitation threshold?
• Which migratory inaccuracy arises when monarch butterfly route maps degrade?
• Which outcome occurs when a ruminant’s abomasum pH increases significantly?
• Which consequence results when excessive hive drone activity distorts bee communication?