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In the resting state, the myosin heads have a partially hydrolysed ATP molecule (ADP + Pi) giving them potential energy. When there is an influx of calcium ions as a result of sarcolemma depolarisation, t...

This kind of question is extremely common in A level biology, they want you to explain a system and apply your knowledge of biological principals to it.

To understand alveoli we need to understand ...

The human eye has high sensitivity because many rods connect to a singular neurone, so many weak generator potentials combine to reach the threshold and trigger an action potential. The human eye has a hi...

The lock-and-key model and the induced-fit hypothesis are two potential models for how substrates may bind in the active site of an enzyme. The lock-and-key model suggests that the substr...

ATP has 3 phosphate groups. Their bonds are unstable and so have a low activation energy, which means they are easily broken. When they break by the addition of water during a hydrolysis reaction, they re...