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Neurons are the basic cells in the nervous system. They are made up of a soma, axon, dendrites and synapse. The synapse is the end part of the neuron that is in charge of sending a message from one neuron...
Oxidative phosphorylation is the process by which energy in the form of ATP is produced when there is oxygen present in the cells. It occurs in the membrane of the mitochondria. Reduced NAD which is produ...
The liver produces bile.Bile is an alkaline solution that neutralises stomach acid. The HCl in the stomach produces acidic conditions. These acidic conditions are not suitable for the rest of the alimenta...
DNA is made up of nucleotides. Each nucleotide contains a phosphate group, a sugar group and a nitrogen base. The four types of nitrogen bases are adenine (A), thymine (T), guanine (G) and cytosine (C). N...
Blood that has been used up by the body (deoxygenated) enters the right side of the heart via a large vein known as the superior vena cava. It enters the right atrium from the top, which then contracts an...
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