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.
Stomata â Stomata are pores in the leaf that allow gas exchange where water vapor leaves the plant and carbon dioxide enters. Special cells called guard cells control each poreâs opening or closing. When stomata are open, transpiration rates increase; when they are closed, transpiration rates decrease. Boundary layer â The boundary layer is a thin layer of still air hugging the surface of the leaf.