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When the muscle is relaxed, tropomyosin fibres wrap around the actin filament, covering up the sites at which myosin can bind with actin.

During muscle contraction, Ca2+ ions bind to troponin compl...

1. Helicase unwinds the DNA double helix strucutre

2. This is done by breaking the hydrogen bonds

3. Only one strand is then used as ...

Normally we think of CO2 as a gas because it is (at least when its in the atmosphere it is). However, it is a very different story inside of cells. CO2 is produced as a result of respiration inside mitoch...

The change from resting potential to action potential is caused by the stimulation of a recpetor, this causes a chain reaction which eventually leads to a positive environement inside the...

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...