Although aldosterone retains Sodium and water, it induces excretion of Potassium. Potassium can be induced by angiotensin II. Antidiuretic Hormone (ADH) ADH is a polypeptide, which is secreted by the hypothalamus, and it is stored in the posterior pituitary gland. ADH is released when water level is low in the blood stream. ADH regulates the body water level by concentrating urine and thereby reducing urine volume.
Gas masks are essential in an evacuation of a biological or chemical disaster. Knowing how to use it properly will increase your chance for survival. There are different types of gas masks, and you should follow the specific instructions for that particular mask.
Because it is very unreactive, helium is used to provide an inert protective atmosphere for making fibre optics and semiconductors, and for arc welding. Helium is also used to detect leaks, such as in car air-conditioning systems, and because it diffuses quickly it is used to inflate car airbags after impact. A mixture of 80% helium and 20% oxygen is used as an artificial atmosphere for deep-sea divers and others working under pressurised conditions. Helium-neon gas lasers are used to scan barcodes in supermarket checkouts.