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.
And although the term imaginal disc is used only for holometabolous insects, it is only the invaginated morphology of most discs that distinguishes them from structures like the external wing pads of hemimetabolous insects, which also are morphologically distinct and form adult wings during the final molt.