Search over 10,000 free study notes

An enzyme is a protein that is used as a catalyst in a reaction within an organism. This is used in such a way that it lowers the energy requirement for a specific reaction to occur and this could either ...

At rest (steady state) there is a greater concentration of Na+ ions and a smaller concentration of K+ ions on the outside compared to the inside of the cell, and the membrane potential is about -70mV. Upo...

This type of question requires careful explanation and therefore would need to be broken down into chunks. One of the reasons for this is that it may be completely new concepts for students. My answer to ...

The stimulus/heat is detected by receptors in the hand It sends an impulse via sensory neurones to the spinal cord/CNSChemicals are transmitted via the synapses and diffuses across the gap The impulses tr...

The left atrium receives oxygenated blood from the lungs via the pulmonary vein (the only vein to pump oxygenated blood) and ejects via the left ventricle to the aorta.Left sided heart failure means that ...