Peptides such as in ghrp 6 are short chains of amino acids linked together by peptide bonds and have a defined sequence. Peptide function primarily as a signalling molecule in animals or as antibiotics in some lower organisms. Peptides are great polypeptide chains comprising up to 50 amino acids which can be classified by function and also by synthesis.

Some common types of peptides are classified by functions including hormones, neuropeptides, and alkaloids. When classified by synthesis, peptides can ribosomes, nonribosomal, and peptonic. The classification system peptide considered an imperfect science as one of the peptides can belong to multiple groups simultaneously and scientists continue to argue as to be classified as a protein peptide, or protein peptides.

Many scientists agree that the peptide does not fit easily into a certain pattern, while the protein is more clearly the nature of the adjustment. Here are the types of peptides and their functions.

– Hormones

Hormones, one of the most common classifications of the peptide in the human body, is a special messenger molecule used in cellular communication. Hormones are identified as such because they are issued and synthesised by a special team of cells, called endocrine glands.

– Neuropeptides

Neuropeptides are widespread in the central and peripheral nervous system and the body has a specific excitatory and inhibitory function. Neuropeptides work in much the same way as neurotransmitters such as serotonin and dopamine. One of the most famous classes of neuropeptides endorphins. Endorphins are considered as endogenous painkillers of the body, often compared to morphine drugs.

– Alkaloids

Alkaloids are peptides that are generally used in the expansion of defence mechanisms on the type of  plants, small animals such as clams and fungi. Ergotamine and dynorphin is a kind of peptide alkaloids.

– Antibiotics

Antibiotics are peptides that stop the growth of microorganisms in the body. They are often used in the treatment to kill disease-causing bacteria.