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Vaccinations contain a dead or inactive form of a pathogen, which is a disease causing microorganism (such as bacteria and viruses). When people are vaccinated, the inactivated pathogen goes through the bloo...

P wave - atrial systole. This is when both atria of the heart contract, to force blood from the atria to the ventricles. The valves that separates the left atrium and the left ventricle is the bicuspid valve...

The scientific term for breathing in is inspiration. The main muscle that helps us to breathe is called the diaphragm; a large, dome shaped muscle that sits below our rib cage. The external intercostal muscl...

Stem cells are human or plant cells which can turn into (differentiate) other cell types, more specialised for their job. They often help with growth of tissues and development of embryos. Human stem cells a...

How I would explain to the student:pollution of streams and rivers because of fertiliser use, open sewers into water courseexcess nutrients get washed up in water courseplants flourish using these mineralsso...