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They squeeze through the walls of blood capillaries, moving through tissues to reach the site of infection. Phagocytes ingest pathogens by endocytosis (phagocytosis), a non-specific immunity, which doesn'...
Arteries carry bloock away from the heart, towards bodyily tissues. They have thick walls to withstand high pressures, a narrow lumen to maintain high pressures and a thick layer of elastic fibre...
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 ...
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