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In order to build immunity to a bacteria only a tiny amount of 'inactivated' bacteria is put into the vaccine. Because the bacteria is dead/inactivated its not able to cause harm to our body but it will s...
Osmosis is the diffusion of water molecules across a partially permeable membrane, from an area of high water concentration to an area of low water concentration. For exam if you're on the tube you will g...
Ventilation of the lungs is a mechanism designed to maintain a high concentration of oxygen present in the alveoli. Blood is delivered to the lungs from the heart deoxygenated, meaning the majority of hae...
Homeostasis is the body's ability to keep the body's internal environment at a condition of equilibrium, in response to any external changes. This includes body temperature, salt concentration, water conc...
The DNA double helix consists of many hydrogen bonds between the base pairs, but in addition there are negatively charged phosphate molecules as a key component of the sugar-phosphate backbone of DNA stra...
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