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The setting of this extract seems to indicate a narrative voice based in one of the southern states, a rural town where work has finished for the day and action has been replaced by a kind o...

When an action potential occurs, the neuron reaches the maximum voltage of +40mV. It then begins to repolarise, with potassium ions diffusing back in to the neuron, down the concentration gradient. This m...

Haemoglobin is a protein consisting of four haem groups contained in four polypeptide chains. The loading of oxygen consists of oxygen binding to iron in the haem group at areas of higher oxygen concentra...

a) Current is defined as the rate of flow of charge; I = Q/t (Current is charge/time).b) Voltage is an electromotive force which drives the charge around the circuit. A potential difference between two po...

The subjunctive is a mood rather than a tense and, unlike in English, is used frequently in the French language in both spoken and written forms. It is used: when expressing personal desire (e.g. je veux ...