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Osmoreceptors in the hypothalamus detect a change in the water potential of blood, this stimulates neurosecretory cells to make and release ADH. ADH travels down the axon to the terminal bulb in the poste...

1. The action potential runs along the presynaptic membrane in a wave of depolarisation and activates the Voltage Gated Calcium ion channels. 2) Once these channels open, Ca2+ diffuses into the presyna...

DNA mutations happen randomly during division by mitosis. Some of these mutations code for antibiotic resistance. When a bacterial colony is exposed to antibiotics most bacteria without the resistance mut...

Water molecules are polar. This means that one end of the molecule is slightly negatively charged (the oxygen atom) and one end of the molecule is slightly positively charges (the hydrogen atoms). The sli...

There are 3 main phases in the cardiac cycle: Diastole, Atrial systole, Ventricular systole 1.Diastole: -The heart fills with blood as the atria and ventricles relax. -Blood flows from th...