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This question was taken from a recent past paper.Let's start by working out what the examiner is looking for here. This question makes it quite obvious, as it states the words 'carbon' and 'cycle', tellin...

Animal cells and plant cells contain structures, called organelles. (ask student what an organelle is; a specialised micro-structure within a cell that has a specific function) Some of these organelles ar...

An action potential arrives at the presynaptic membrane of the pre-synaptic neuron causing the calcium ion channels to open. This opening causes vesicles filled with neurotransmitter to fuse with the pre-...

An endotherm detects external temprature increases through peripheral skin receptors just beneath the skins surface. This causes impulses (action potentials) to travel to the thermoregulatory centre in th...

The artery is composed of elastic fibres which allow the artery walls to stretch following ventricular systole, so that the artery is able to maintain the high pressure.The artery has a smooth endothelial...