QS Study

Succus Entericus (or intestinal juice) the clear alkaline fluid secreted by the glands of the small intestine. It contains mucus and digestive enzymes, including enteropeptidase, erepsin, lactase, and sucrase. It acts on the end products of the food reactions and makes them simple and absorbable. It refers to the clear to pale yellow watery secretions from the glands lining the small intestine walls.

Daily secretion: 2000 ml/day.

pH: Small intestine – 7.5 – 8.0

Brunner’s gland secretion – 8.0 – 8.9


  1. Water → 98.5%
  2. Solid → 1.5%

(a) Organics

(i) Proteolytic enzymes,

– Enteropeptidase – Amino peptidase – Dipeptidase – Nuclease etc.

(ii) CHO slitting enzymes –

Sucrase, Maltase, Isomaltase, Lactase etc.

(iii) Fat Splitting enzymes – Lipase

(iv) Others –

Cholesterol esterase – Phosphatase – Lecithinase etc.

(b) Inorganic

Cations: Na+, K+, Ca++; (ii) Anions: HCO3.

Functions of Succus intericus

  1. It helps in digestion of all 3 types of stable food because of presence proteolytic, fat and CHO splitting enzymes.
  2. It also helps in absorption.
  3. It excretes some heavy metals.