regurgitation (Science: cardiology, gastroenterology) A backward flowing, as the casting up of undigested food or the backward flowing of blood into the heart or between the chambers of the heart when a valve is incompetent. Origin: L. Gurgitare = to flood..
The human respiratory system is an efficient system of inspiring and expiring respiratory gases. This tutorial provides ..
This tutorial recognizes the importance of food as a source of energy that will fuel many biological processes. A good d..
This tutorial elaborates on how the nervous system works, particularly at the tissue level of the brain. There are three..
Multicellular organisms evolved. The first ones were likely in the form of sponges. Multicellularity led to the evolutio..
A still body of water may be disturbed by a variety of factors. One of them is wind. In fact, it is considered as the pr..
Plants and animals need elements, such as nitrogen, phosphorus, potassium, and magnesium for proper growth and developme..
