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The cell membrane is made up of something called the phospholipid bilayer. This is exactly what it sounds like:a hydrophilic phosphate head on the outside and a hydrophobic lipid on the inside. They form a b...

A synapse is a junction between the end of one neuron (known as the pre-synaptic neuron ) and either another neuron (known as the post-synaptic neuron ) or another tissue such as muscle (such as at the neuro...

The respiratory system is a collection of organs working together in order to oxygenate the blood and remove the waste product carbon dioxide. The respiratory system uses a method of gaseous exchange in the ...

Evolution is a gradual change in the inherited traits of a population over many generations. Natural selection is a mechanism where the members of a population best suited to their environment have the best ...

A chamber wall's thickness is directly linked to its function. Each of the 4 chambers has a different function and so, they each have different wall thickness. The more work a chamber has to do, the thicker ...