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Angiotensin 1 is a decapeptide (ten amino acids), which is converted to angiotensin 2 (eight amino acids). The latter has more hypertensive effect and also stimulates the release of aldosterone from adrenal gland. Methionine enkephalin is a pentapeptide found in brain. Functions: It has opiate-like function and inhibits the sense of pain. Bradykinin and kallidin are…

ADH is also a nanopeptide produced by posterior pituitary gland. Functions: It stimulates the kidney to retain water and thus increases blood pressure.

It’s a hormone secreted by posterior pituitary gland and contains nine amino acids (nanopeptide). Functions: It stimulates the contraction of smooth muscles, especially during childbirth.

It is a tripeptide secreted by hypothalamus.   —OOc—Glu—His—Pro—NH2 Functions: It stimulates pituitary gland to release thyrotropic hormone.

The reversible oxidation–reduction of glutathione is important for many of its biological functions. It maintains a ratio of about 10011 of GSH to G—S—S—G. Glutathione (reduced) performs specialised functions in erythrocytes. It maintains RBC membrane structure in integrity. It protects haemoglobin from getting oxidised by agents such as H2O2. It involves in the transport of…

It is a tripeptide composed of three amino acids. Chemically, glutathione is γ—glutamyl—cysteine—glycine. It is widely distributed in nature and exists in reduced or oxidised states. Structure of glutathione is as given below:

Several peptides occur in the living organisms that display a wide spectrum of biological functions.