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Homeostasis refers to the processes that occur in our bodies to maintain various factors at set values. An example of this is control of body temperature. For example, if the temperature is too high, we begi...

a) Proteins, which are highly-folded poplypeptides, are broken down into shorter polypeptides, and then into amino acids, by protease enzymes. b) Fats, or lipids, are broken down by enzymes such as lipase in...

Enzymes are biological catalysts - they 'speed up' biological reactions - essentially increasing the rate at which they occur. Pepsin is an enzyme that catalyses the digestion of proteins in the stomach into...

All of this is to do with moving stuff over a barrier called a cell membrane. I want you to imagine the cell membrane to be like a border of a country and the stuff to be different pizzas being delivered ove...

Oxygenated blood flows into the left atrium from the lungs via the pulmonary vein, when the left atrium contracts the blood flows down into the left ventricle via the mitral valve (which divides the atrium f...