Which explanation of the cooling effect produced by an ice-pack when applied to the skin is the best one?
- Cold applied to the skin causes vasodilation thus allowing more blood to pass through the tissue adjacent to the ice pack and be cooled.
- Heat withdrawn from the body is used to provide the ice with the latent heat of vaporisation it requires to melt, until melting is complete, the temperature of the icepack remains constant.
- Cold transfers along its temperature gradient – from ice pack to skin – the melting ice & water mixture ensures good contact with the skin.
- Heat withdrawn from the body (at 37 °C) is used to provide the ice (at 0 °C) with the latent heat of fusion it requires to melt, until melting is complete, the temperature of the icepack doesn’t rise appreciably.
Medicine
D: Cold cause vasoconstriction no vasodilation. Body heat provides the icepack with latent heat of fusion (melting) not vaporisation. Heat transfers, not “cold”.
need an explanation for this answer? contact us directly to get an explanation for this answer