Question:

A lubricant mucin, in saliva is made up of

Updated On: Apr 2, 2024
  • polyunsaturated fats
  • actin and myosin
  • glycoproteins
  • phospholipids
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The Correct Option is C

Approach Solution - 1

The correct option is (C): Glycoproteins
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Approach Solution -2

Explanation:

  • Mucin is a lubricant found in saliva that is primarily composed of glycoproteins called mucins. 
  • Mucins are large, heavily glycosylated proteins that contain a protein core with numerous attached carbohydrate chains.
  • These carbohydrate chains, known as oligosaccharides, are responsible for the gel-like properties of mucins, contributing to their lubricating and protective functions.
  • In addition to mucins, saliva contains other components such as water, electrolytes (e.g., sodium, potassium, chloride), enzymes (e.g., amylase, lipase), antibacterial agents, and various proteins and peptides.
  • However, mucins play a crucial role in providing lubrication and forming a protective barrier in the oral cavity, aiding in functions such as swallowing, speaking, and protecting the oral tissues from mechanical damage and microbial invasion.
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Concepts Used:

Digestion and Absorption - Alimentary Canal

Digestion can be defined as the process of breakdown of large, insoluble and complex food molecules into smaller ones for its absorption and circulation in the body. This process involves the usage of a variety of digestive fluids and enzymes, including saliva, mucus, bile and hydrochloric acid, among others.

Read More: Digestion and Absorption

The alimentary canal is mainly referred to as the pathway by which food enters our body and moves out through the anus after digestion. It is a tube-like structure that starts from the mouth and ends in the anus. The alimentary canal plays a primary role in human digestion and is also termed as the digestive tract.

Peristalsis is a series of wave-like muscle contractions that move food through the digestive tract.