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Contain haemoglobin - a molecule that can bind reversibly to oxygen. Biconcave disk shape - increases surface area to allow more diffusion of oxygen. No nucleus - allows more space for haemoglobin. Flexib...

They both start with 20 sweets. To get the total number of sweets that Jack has, you need to take away x because that is the amount that he gives to will. Jack then eats 5 of his sweets so you need to tak...

The cardiac cycle, by convention, is considered to begin with depolarisation of the sino-atrial node (SAN). This depolarisation spreads across the two atria, causing the right and left atria to contract. ...

An atheroma is the deposition of fatty material in the innermost lining of an artery (caused by the process of 'atherosclerosis').
Atheromas have a tendency to rupture and this increases the likelih...

No puede haber ninguna duda de que la velocidad de la vida moderna está beneficiando nuestra salud. Ser capaz de completar varias tareas en un período de tiempo más corto nos da más tiempo para gastar hac...