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The cold-water immersion question I basically said everything you said with the reduced blood flow due to the cold, but didn't specify the word vasoconstriction. Lose a mark?
If you have a really good answer I think you'll get full marks

I know I said "almost essential" (I'll probably stick to that, although maybe Hanson disagrees), and that's because VCAA has made a point of that on contrast water therapy questions, but if you've made it clear you understand the concept through other means, you should be rewarded. And i guess you could talk about other things; quite a few mechanisms exist here.