You have been sitting on a plane for six hours without moving. Blood has been pooling in your veins. When you stand up, you feel dizzy. Why do you think this is?

You have been sitting on a plane for six hours without moving. Blood has been pooling in your veins. When you stand up then gravitational forces affect venous return, cardiac output, arterial and venous pressure. When person is sitting on a plane then gravitational force is same on upper and lower extremities such as thorax, […]

Green revolution

The large gains in agricultural production from the 1940s -1980s due to improved strains of crops, improved irrigation. and the development of fertilizers and pesticides is referred to as the Green revolution It increases the production of food grains such as wheat and rice especially in developing countries like India by introduction of new, high-yielding […]