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Gas exchange is when oxygen is transferred from the air in the lungs to the blood and carbon dioxide is transferred from the blood to the air in the lungs. It occurs in the alveoli of the lungs.The lungs hav...

Endosymbiosis is where two organisms live together, one inside the other: endo=in, sym=together and biosis=living. It is believed that mitochondria originated as eubacteria that were intracellular parasites ...

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 ...