The herb Indian spikenard is another effective home remedy for low blood pressure. It should be taken in doses of thirty to forty grains with a pinch of a little camphor and cinnamon (cinnamon). An infusion can also be prepared by steeping 15 to 20 gm of the herb in 250 ml of boiling water, and taking it thrice a day.
Alveoli. Alveoli are the functional units of the lungs that permit gas exchange between the air in the lungs and the blood in the capillaries of the lungs. Alveoli are found in small clusters called alveolar sacs at the end of the terminal bronchiole.
To maximise the efficiency of gas exchange, the alveoli have several adaptations: They are folded, providing a much greater surface area [surface area: The area of the surface of an organism or membrane.] for gas exchange to occur. The walls of the alveoli are only one cell thick. This makes the exchange surface very thin - shortening the diffusion distance across which gases have to move.