Question

The breakdown of biomolecules occurs in the_(A)__and simple substances thus formed are absorbe
in_(B)__ regions of small intestine.
a) (1)
Stomach
Duodenum
D) (2)
(3)
(4)
Duodenum Jejunum and ileum
Jejunum lleum and colon
Colon Jejunum and ileum​

Answer 1

Answer:

The final statement can be written as:

The breakdown of biomolecules occurs in the Duodenum & Jejunum and simple substances thus formed are absorbed in the ileum regions of the small intestine.

NOTE: Although the chemical and mechanical breakdown of food occurs from the mouth to the jejunum of the small intestine, the majority of it occurs in the duodenum and jejunum.
Absorption of food also occurs in the jejunum.

Thus, OPTION 2 is the appropriate choice here.

Explanation:

What is digestion?

Digestion is the process in which complex organic and inorganic molecules are broken down into simpler forms by the action of enzymes, and are ultimately absorbed by the blood, with the removal of the undigested matter in the form of faeces.

It involves four stages:

• Intake of food
• The mechanical and chemical breakdown of food
• Absorption
• Removal of undigested particles

Site of mechanical and chemical breakdown:

• Digestion starts itself right from the intake of food where,
  Mechanical breakdown occurs as the food particles are crushed by the teeth and converted into bolus after mixing with saliva, and,
  The chemical breakdown of carbohydrates occurs due to the action of the enzyme salivary amylase.
• In the stomach, the digestion of proteins occurs due to the presence of various proteolytic enzymes.
• In the duodenum of the small intestine, the rest of the biomolecules are broken down into simple, absorbable forms. The majority of the chemical digestion occurs here.

Site of absorption:

The digested particles are taken up by the blood vessels lining the ileum region of the small intestine. The presence of finger-like folds called intestinal villa increases the surface area of absorption.

You can learn more about the mechanism of digestion by referring to the links below:

Process of digestion in humans. explain.
https://brainly.in/question/473682

What is the mechanism of digestion in humans?
https://brainly.in/question/9427664

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