Definition of the Smooth ER. The smooth endoplasmic reticulum, or smooth ER, is an organelle found in both animal cells and plant cells. An organelle is a sub-unit within a cell that has a specialized function.The main function of the smooth ER is to make cellular products like hormones and lipids.he smooth endoplasmic reticulum, or smooth ER, is an organelle found in both animal cells and plant cells. An organelle is a sub-unit within a cell that has a specialized function.
Definition of suprailium. : a cartilaginous epiphysis at the sacral end of the ilium of some animals.
Sarcoplasmic reticulum. Definition. noun. The special type of smooth endoplasmic reticulum found in smooth and striated muscle fibers whose function is to store and release calcium ions. Supplement. The sarcoplasmic reticulum releases calcium ions during muscle contraction and absorb them during relaxation.