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Homeostasis is the maintenance of a constant internal environment (in response to internal or external changes in the environment)Homeostasis can be maintained by negative feedback mechanisms which detect ch...

This question was made using AQA specifications. The reflex arc is a series of events connecting a stimulus to a response. The stimulus, for example a hand touching a hot pan, stimulates the receptor, which ...

Bile is a substance synthesised in the liver and released by the gall bladder. It is released into the small intestine and helps breakdown large fat droplets into smaller ones, via emulsification. This incre...

via diffusion down a concentration gradient as O2 levels are higher in the lungs than in the blood. for faster diffusion you need:a large surface area (lungs have million of alveoli which are air filled sacs...

Blood glucose levels are controlled by the pancreatic release of the hormone insulin. Insulin is released from the pancreas when blood glucose concentration is high. This causes glucose to move from the bloo...