transportation operations

>Is it necessary that a single travelling person use a four wheeler? Can we not partially replace the transport needs by electrically operated public transport systems than present petroleum dependent vehicles? Is there any possibility using electricity operated..

This process is much faster and requires energy. A membrane pump operates across the cell membranes which transports the nutrients from the lumen of the intestine into the cells. This transport occurs with the help of ATP molecules. The carrier proteins in the membran..

The growth of plants is regulated by certain chemical substances, which are synthesized by the plant in very small quantities. These substances are formed in one tissue or organ of the plant and are then transported to other sites where they produce specific effects on growth and developm..

The passage of blood throughout the body under the influence of the pressure exerted by the heart is called circulation. In mammals and birds the circulation is called double circulation. This is because the blood passes twice through the heart during one round of circulation. The other vertebrates..

>Cilia can perform a variety of functions: 1. In certain molluscs, cilia help to pass water currents over the gills 2. In echinoderms cilia helps to drive water through the water vascular system, (locomotion) 3. Cilia of the cells lining the respiratory tract of humans help to drive away the microb..

Control of the Heart Function - The control of the heart function is by a set of muscles and is, therefore, called myogenic . If the heart is removed from a living mammal and placed in a well oxygenated salt solution maintained at 37 o C, the heart continues to function though at a slower rate. Pos..