Secretion – Class 11 | Chapter – 19 | Biology Short Notes Series PDF

Secretion: The production and discharge of material from a cell, gland, or organ is referred to as secretion. The secretory products of humans include hormones, enzymes, and saliva. Endocrine glands produce hormones, while gastric glands in the stomach’s lining produce enzymes. Hormones are secreted into the bloodstream in order to reach their target. 


Hormones and enzymes help to speed up and control biological reactions. Saliva moisturizes, lubricates, and protects the mouth. Within the cells, the Golgi apparatus is involved in secretory material creation and release. Depending on the cell type and the chemical being carried, secretion occurs via a variety of paths. 

Secretory Routes

  • Lysosomes 

Lysosomes are organelles that are commonly assumed to be primarily responsible for dehydration, although they also play a role in secretion. Certain specialized cell types, such as pigment cells and blood stem cells, use the lysosomal secretory route regularly. Lysosomes, like secretary vesicles, can fuse with the cell membrane to release their contents, but the fusion process requires a distinct type of protein.

  • Porosomes and the ER-Golgi Pathway 

Secretory products are first synthesized in the endoplasmic reticulum, then put into spherical containers like vesicles, known as transport vesicles, which are formed of a lipid bilayer. These products are subsequently changed in the Golgi apparatus before being packaged into specialized secretory vesicles.

  • Membrane Transports 

Proteins in the cytosol can travel through the cell membrane via transporter proteins rather than exocytosis in some instances. The products are not packaged in vesicles in this situation, but rather are delivered separately by specific proteins in the cell membrane.

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By Team Learning Mantras