LIFE SCIENCE

Detailed explanation-1: -The metazoan endoplasmic reticulum (ER) serves both as a hub for maturation of secreted proteins and as an intracellular calcium storage compartment, facilitating calcium-release-dependent cellular processes.

Detailed explanation-2: -These enzymes of the smooth endoplasmic reticulum help detoxify drugs and poisons, especially in liver cells. Detoxification by smooth ER usually involves adding a hydroxyl group to drug molecules, thus making them more soluble and easier to flush from our body.

Detailed explanation-3: -Smooth endoplasmic reticulum in liver cells of vertebrates helps in detoxifying poisons and drugs. It contains enzymes that catalyze a number of reactions that can make lipid-soluble drugs and metabolic wastes into water-soluble so that these can easily be expelled out from the body.

Detailed explanation-4: -The SER is a storage site for calcium within cells. Calcium is pumped into the SER by active transport and released in response to hormonal signals. This is particularly important in muscle cells where the SER is so prominent it has a special name, the sarcoplasmic reticulum.