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The plasma membrane is composed of a phospholipid by-layer. These phospholipid molecules are arranged in a double sheet which are stable yet fluid. These molecules have hydrophobic tails and hydrophilic h...
The electrical activity of the heart begins in the sinoatrial node which is a collection of pacemaker cells located in the right atrium. These cells spread electrical activity across the atrium causing bo...
Evolution by natural selection arises when these three properties are present in a system
Heredity - offspring resemble their parents in discrete characteristics.
Variat...
The reflex arc describes a sequence of events leading to an action that takes place rapidly in response to a stimulus without having to think about it i.e. without an impulse travelling to the brain for c...
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