EXCRETION 13. Explain why higher animals require an efficient excretory system. - To avoid accumulation of excretory / waste products of metabolism. - To avoid alteration of conditions under which cells work. 14. Explain the role of the following components of the skin when the temperature is high, a) Sweat glands - Produce sweat; which evaporate causing a cooling effect b) The Erector pili muscle - Relax hair lies flat; less air is trapped between hairs causing more heat loss by convection/radiation c) Blood arterioles - Blood arterioles vasodilate enhancing more blood flow near the surface of the skin leading to more heat loss by convection/radiation.
Posted on: Sat, 06 Dec 2014 13:03:04 +0000
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