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Can efficiently absorb sunlight- upper part of leaf contains tightly packed palisade mesophyll cells; cells have large vacuole which pushes chloroplasts to the edge of leaf and well devel...
The action potential lies at the heart of how we think, move and sense, as it constitutes the language of the nervous system. The two main characters in the spectacle of the action potential are ...
blood sugar concentration is controlled through a negative feedback loop*. When blood glucose concentration is high, insulin made in the pancreas is released into the bloodstream. Glucose is taken into ce...
When B-lymphocytes are stimulated by antigens, they first divide by mitosis to form clones, some of which become plasma cells that secrete antibodies, others become memory B-cells which can be stimulated ...
Phagocytosis is when a white blood cell - or "phagocyte" - engulfs a pathogen that has entered the body and has made it past the body's physical barrier defences.The phagocyte first locates the ...
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