human digestion rate

The lymph is circulated in the body with the help of the action of the muscles surrounding the lymph vessels. Thus, the movement of lymph is slow and uncertain. Exercise improves the rate of lymph flow. The lymph vessels are provided with valves to prevent backflow of the lymph. Throughou..

The physical movements associated with the gaseous exchange are called breathing. They are controlled by the respiratory centre of the medulla oblongata in the human brain. Thus, the breathing movements are involuntary to a large extent. However, we can control the rate of brea..

Breathing Mechanism - The physical movements associated with the gaseous exchange are called breathing. The various structures that are involved in the breathing mechanism are the respiratory passage, the lungs, the outer and inner intercostal muscles, the diaphragm and the muscles attached to the ..

Processes by which substances are transformed to one or several products are called chemical reactions. Chemical processes that occur in the presence of light, like sunlight, are called photochemical reactions. These processes can occur naturally or under controlled conditions in the laboratory. To..

Apart from air, the most abundant substance on the earth is water. Humans need water for drinking, bathing, sanitation, washing, cooking etc. Modern agriculture, industry, transport, power generation, civic facilities etc., cannot exist without water. Our body needs water for digesti..

. DNA fingerprints are so accurate that even full siblings are readily distinguished from one another. More than 99 percent of the DNA is exactly the same in all humans. But DNA fingerprinting focuses only on the part that tends to differ from one person to the other. Throughout the ..

Controlling the pollution has been a most challenging field for human civilization. Understanding the gravity and variety of pollution in different walks of life and studying their serious implications on human health, animal health, ecological problems, urban life style, and ma..

Increasing population is a serious issue, particularly in developing countries. It is necessary for every generation to produce more off springs because many individuals do not survive to reach the reproductive age due to natural causes. However, man has upset this equation as he has been successfu..

Interrelationship of Population, Environment and Development - As mentioned earlier man's intervention is causing drastic changes in the environmental systems of earth and disturbing its ecological balance. This disturbance gets compounded with the problem of population explosion in the world espec..

Population Control - Increasing population is a serious issue, particularly in developing countries. It is necessary for every generation to produce more off springs because many individuals do not survive to reach the reproductive age due to natural causes. However, man has upset this equation as ..