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Contraction occurs when an impulse from a motor neurone reaches the synapse at the junction with the muscle, the neuromuscular junction (NMJ). 

At the pre...

Both aldosterone and cortisol are produced in the adrenal cortex of the adrenal gland (which are situated above the kidneys on either side of the body). 

Aldosterone is a mineralocorticoi...

Kuppfer cells are a specialised type of macrophage. They travel within the sinusoids of the liver and breakdown and recycle old red blood cells. 

Red blood cells contain heamoglobin, and ...

This is a question from the AQA June 15 Biology A level past paper. 

Short answer: Raised testosterone causes a physiological decrease in GnRH as well as LH and FSH via negative ...

The fossil record provides a comprehensive array of evidence for evolution. For example Darwin studied Brachiopods, and within rocks you can see the clear change in the Brachiopods through time. The fo...