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Reflexes are involuntary and instantaneous actions that occur in response to a stimulus, for example our pupils contracting in response to a bright light. The receptor detects this stimulus and sends an e...

If blood vessels are damaged, such as by a cut in the skin, blood clots to perform two functions. 1) to reduce or stop blood loss2) to prevent the entry of pathogens
This triggers a cascade of events...

Osmosis is the net movement of water from an area of high water potential to low water potential through a semi-permeable membrane, while diffusion is the net movement of any liquid or gas from an area of...

Considering the heart has 4 distinct chambers - for this question it's best to start in the right atrium. (Supported by a diagram) Deoxygenated blood is returned to the right atrium from the rest of the b...