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Gas exchange surfaces tend to have the adaptation a large SA:volume ratio. This is advantageous as it increases the area over which gases and other materials can be transported into and out of the organis...

Nerve impulses are propagated in the form of action potentials, involving the rapid depolarisation of the nerve cell membrane from  -70mV to +30mV, before repolarisation occurs returning the membrane pote...

Whenever you see an integral with a product as the integrand, check if integration by parts works.
That is,
Int(v(x)*u'(x)) = u(x)v(x)-int(u(x)v'(x))
So you should see that its easier ...