Search over 10,000 free study notes

A nerve cell when at rest is negatively charged, this means that on the inside it is more negative than on the outside. The potential difference is around -70mV. The mechanism that helps to achieve that p...

An increase in temperature increases kinetic energy of particles, so collision frequency increases and more enzyme-substrate complexes are formed, therefore rate of reaction increases. The rate of reactio...

DNA is contained within the nucleus of the cell. It contains genes which are a sequence of DNA codes. Each gene codes for a protein. All the DNA is coiled into structures called chromosomes. There are 46 ...

First of all an action potential reaches the end of a motor neuron and the neurotransmitter acetylcholine is then released into the synapse. An action potential is initiated in the muscle cellSarcoplasmic...

During depolarisation, sodium ions move into the cell, resulting in the membrane potential rising from -70 millivolts (mV) to +40mV.During repolarisation, potassium ions move out of the cell, and the memb...