Winterbottom’s sign
(Science: clinical sign) swelling of the posterior cervical lymph nodes, characteristic of early stages of african trypanosomiasis; useful for surveys or control of migrations from endemic areas of persons with preclinical infections.
Organisms employ different strategies to boost its defenses against antigens. Humans have an immune system to combat pat..
This tutorial describes the different types and causes of brain damage. Find out how genetics, physical injury, lack of ..
The gastrointestinal system breaks down particles of ingested food into molecular forms by enzymes through digestion and..
If the balance of nature is left untouched, landscapes can change dramatically over time. A previous ecosystem is supers..
The movement of molecules (specifically, water and solutes) is vital to the understanding of plant processes. This tuto..
Viruses possess both living and non-living characteristics. This unique feature distinguishes them from other organisms...