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..
Seed plants are vascular plants. They differ from the other vascular plants in producing seeds that germinate into a new..
Upon fertilization, a zygote forms and develops into an embryo. This tutorial elaborates on the growth and development f..
Control of Growth & Development tutorials look at how the genetic makeup determines the biological processes on a da..
The circulatory system is key to the transport of vital biomolecules and nutrients throughout the body. Learn about the ..
Organisms employ different strategies to boost its defenses against antigens. Humans have an immune system to combat pat..
Meet the colorful takahē, an extremely rare flightless bird. Find out more about its unique features and why they matte..
