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The increased pressure caused by the stimulus opens pressure gated sodium ion channels allowing Na+ ions to diffuse (down a concentration gradient) into the axon. This sudden influx of Na+ ions causes a l...

An artery carries blood away from the heart. The blood is oxygenated with the exception of the pulmonary and umbilical artery. The vessel must cope with high pressure demands and therefore has thick, elas...

Genotype is the alleles that you have for a specific gene

Phenotype is the physical expression of the genotype (think phenotype, physical expression to remember which is which!)

Receptors  have the abilty to detect a stimuli which include changes in surroundings such as pressure on the skin. This stimuli is then converted into an impulse.  Examples of receptors include the retina...

Firstly the resting membrane is set by Na+/K+ ATPase so that 3 Na+ moves out for every 2K+ that moves in; this creates a negative membrane potential of around -65mV. To initiate an action potential the me...