ICSE Class 9 - Skin and Heat Regulation of the Body Videos

• oxygen debt
• If capillaries don't have muscles then how can they contract and expand during vasoconstriction and vasodilation ??? 
• Why are the sweat pores more numerous on the palms? What do you mean by surface tension?
• Explain tht meaning of the terms cold-blooded and warm-blooded (homeothermal). 

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