GENERAL HISTOLOGY

Detailed explanation-1: -Endoplasmic Reticulum (E.R.)-Passageways that carry proteins, etc. from one place to another. Hollow tubular structures that travel around the cytoplasm.

Detailed explanation-2: -Endoplasmic reticulum is a network of membranes inside a cell through which proteins and other molecules move. Proteins are assembled at organelles called ribosomes.

Detailed explanation-3: -(c) The ER (endoplasmic reticulum) functions both as passageway for intracellular transport and as a manufacturing surface.

Detailed explanation-4: -Introduction. The tubular endoplasmic reticulum (ER) network is a morphologically unique part of the ER that consists of interconnected cylindrical membrane structures, with a diameter of  30 nm in yeast and  50 nm in higher eukaryotes (Hu et al., 2011).

Detailed explanation-5: -From the endoplasmic reticulum, proteins are transported in vesicles to the Golgi apparatus, where they are further processed and sorted for transport to lysosomes, the plasma membrane, or secretion from the cell.