Search over 10,000 free study notes

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 a...

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 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 mus...

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 indivi...

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 ...