Gel
jelly like material formed by the coagulation of a colloidal liquid. Many gels have a fibrous matrix and fluid filled interstices: gels are viscoelastic rather than simply viscous and can resist some mechanical stress without deformation.
Examples are the gels formed by large molecules such as collagen (and gelatin), agarose, acrylamide and starch.
This tutorial looks at some of the communities in freshwater lentic habitats. For instance, symbiosis occurs in a commun..
Hormones are essential in the regulation of the activity of the various biological systems of the human body. The ineffi..
Homeostasis is the relatively stable conditions of the internal environment that result from compensatory regulatory res..
The human respiratory system is an efficient system of inspiring and expiring respiratory gases. This tutorial provides ..
Following nine months inside the mother's womb is the birth of the baby. Know the different stages of the birthing proce..
Multicellular organisms evolved. The first ones were likely in the form of sponges. Multicellularity led to the evolutio..
