Question

1. list and describe three major functions of the smooth er. 1. 2. 17. what is the major function of the rough er?

Explanation:

The smooth endoplasmic reticulum (ER) has several functions. Lipid synthesis: It is involved in the production of lipids such as phospholipids and steroids. Detoxification: It helps in the detoxification of drugs and harmful substances by modifying them to make them more water - soluble for excretion. Calcium ion storage and release: It stores and releases calcium ions which are important for muscle contraction and other cellular processes. The rough ER has ribosomes attached to its surface and its major function is protein synthesis and modification. Newly synthesized proteins enter the lumen of the rough ER where they may be folded, glycosylated, or otherwise modified.

Answer:

16.

1. Lipid synthesis: Produces phospholipids and steroids.
2. Detoxification: Modifies drugs and harmful substances for excretion.
3. Calcium ion storage and release: Stores and releases calcium for cellular processes.
4. Protein synthesis and modification: Synthesizes new proteins and modifies them (folding, glycosylation etc.) in its lumen.