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Skeletal muscle (one of the three types of muscle in our body) contracts by excitation-contraction coupling, or the sliding-filament theory. It all starts when an action potential fires along a motor neurone...

Factorising is the process of putting brackets into an equation. Ideally the end equation should be as simple as possible, with the smallest numbers possible. The first step is to find the factor pairs of th...

There are three main ways that an invading pathogen can result in disease: Damage or destroy host cells This is host specific and ligands on the pathogen must fit host receptor proteins on the host cell. Thi...

Let's take the example: 3( x + 2) + 2( x - 1) Start with the first part: 3( x + 2) We have to multiply what is outside of the bracket with the individual things inside the bracket sparately and add them toge...

This is the sort of question you are likely to stumble across in an IB HL Paper 2 examination. It would probably carry a few more marks and thus require a longer answer, but that is reason to panic!First of ...