In vertebrates, smooth endoplasmic reticulum in cells of which organ plays a crucial role in detoxification of toxic compounds? a) Spleen b) Intestine c) Kidney d) Liver

In vertebrates, the liver is the primary organ responsible for the detoxification of toxic compounds and xenobiotics [4]. At the cellular level, this function is specifically carried out by the smooth endoplasmic reticulum (SER). Unlike the rough ER, which is involved in protein synthesis, the SER is a network of tubules specialized for lipid and steroid biosynthesis, calcium storage, and drug detoxification [1]. In hepatocytes (liver cells), the SER contains specialized enzymes, such as the cytochrome P-450 family, which facilitate the metabolic breakdown of harmful chemicals, drugs, and pollutants into less toxic or more water-soluble forms for excretion. While other organs like the kidneys contribute to excretion, the liver's high concentration of SER makes it the central site for the initial biotransformation and detoxification of foreign substances [4].

Sources

1. [4] https://pmc.ncbi.nlm.nih.gov/articles/PMC7149729/
2. [1] https://pmc.ncbi.nlm.nih.gov/articles/PMC6894516/