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The sinoatrial node (SAN) sends a wave of electrical activity across the atria causing atrial contraction. The non-conducting tissue stops the immediate contraction of the ventricles. The atrioventricular...

Krebs cycle is a series of reactions that take place in the mitochondria of most living cells and result in the production of energy during aerobic respiration. During Krebs cycle oxygen is metabolised...

Tropomyosin helps to regulate myofibril contraction. Before contraction, tropomyosin covers the myosin binding sites on the actin molecule, preventing the myosin heads from binding. During contraction, ca...

Sickle cell disease is caused by a recessive allele of the haemoglobin gene. When two copies are present (i.e. it is homozygous), many red blood cells become sickle-shaped, leading to disease.

Everyone has their own ways of remembering things, but there are some good general points that might help you out.

If you just read over things, you might find that you can...