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.
The central part is called the adrenal medulla (or medulla) and the outer portion is called the adrenal cortex (or cortex). These two parts of the gland produce different hormones that are essential for life.The adrenal medulla produces mostly adrenaline and noradrenaline.he central part is called the adrenal medulla (or medulla) and the outer portion is called the adrenal cortex (or cortex). These two parts of the gland produce different hormones that are essential for life.