In this case, the damper is normally opened by the force of the spring but can be closed by the force of the motor. Removal of electrical power re-opens the damper. This style of damper is advantageous because it is fail safe; if the control to the damper fails, the damper opens and allows air to flow.
The adrenal glands, located on the top of each kidney, are responsible for releasing different classes of hormones. The outer part of the gland, called the adrenal cortex, produces the hormones cortisol (pronounced KAWR-tuh-sohl) and aldosterone (pronounced al-DOS-tuh-rohn). The inner part of the gland, called the adrenal medulla (pronounced muh-DUHL-uh), produces the hormones adrenaline and noradrenaline.
What do the adrenal glands do? The medulla is located in the center of the gland and makes adrenalineAdrenaline - the hormone that helps control the fight or flight response and puts the body on high alert (also known as epinephrine) and noradrenaline. These hormones are also known as epinephrine and norepinephrine.