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Absorption from GIT - Types

  • Absorption is the process by which the end products of digestion of nutrients, minerals, vitamin, water etc. are absorbed through the intestinal mucosa into the blood and lymph. Most of the minerals are absorbed from small intestine. In man and other vertebrates, the intestines are greatly folded to increase the surface area of absorption.
  • Many finger like projections called villi are present in the small intestine. Each villus has a network of blood capillaries and a network of lymph capillaries in its centre, into which nutrients are absorbed.
  • The absorptive area is further increased by the presence of microvilli. These… (315 more words) …

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Comparison of two types of cells in salivary gland

Two types of cells in salivary gland

Comparison of two types of cells in salivary gland

Sn.

Mucous cells

Serous cells

1.

They contain large translucent

mucinogen granules which consists of

precursor of mucin.

They contain opaque small zymogen

granules containing a precursor of

ptyalin

2.

Forms a viscous secretion containing

mucin, it lubricates food and protects

oral mucosa.

Forms thin watery secretion containing

Ptyalin (or salivary amylase), which

Helps in digestion of starch.

Salivary secretion

  • Quantity is 1 to 1.5 liters in 24 hours.

    • 70 % by Submaxillary gland

    • 25 % by Parotid gland

    • 5 % by Sublingual glands… (547 more words) …

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