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In order to survive. By the time the blood reaches the placenta there is a lower concentration of oxygen in the blood, the fetal haemoglobin has a higher affinity for oxygen so that the hb can bind to oxy...
Digestion takes place in the stomach. Aside from physical digestion due to churning of the stomach muscle, chemical digestion is also important whereby hydrochloric acid produced by the stomach of pH 2, a...
Rhodopsin is the pigment found in rod cells, which consists of cis-retinal and the protein opsin. When the rod cells are kept in darkness, the opsin is uncoupled from the cell surface membrane of the rod ...
The sinoatrial node is a region found on the right atrium which acts as a pacemaker. Cells at the SAN can depolarise (become more positively charged with respect to the outside) and generate electrical ac...
DNA is comprised of many 'building blocks' known as deoxyribose nucleoside triphosphates (dNTPs). Each dNTP is made of a base (adenine, guanine, cytosine or thymine), bonded to a 5-carbon sugar molecule a...
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