Question

Digestion system of cockroach

Answer 1

Answer:

The digestive system consists of the alimentary canal and digestive glands. The alimentary canal of cockroach is divided into foregut, midgut, and hindgut. The mouth opens into a short tubular pharynx, leading to a narrow tubular  

Answer 2

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❤. Digestive system of cockroach❤

⭐. The digestive system of cockroach consist of 1.Alimentary canal 2. Digestive glands.

❤. Alimentary canal ❤

⭐. The alimentary canal extends from mouth to anus .

⭐. It divided into 3 region .They are 1. Foregut 2.Midgut 3.Hindgut.

❤. FOREGUT ( Stomodaeum )❤

• Foregut has pharynx, oesophagus , crop and gizzard.
• pharynx is a very short tube.It leads into a narrow tubular oesophagus.
• oesophagus opens into a sac like crop.It stores food for digestion.
• Its outer surface covered by tracheal tubes.
• Behind the crop there is a thick walled muscular gizzard.
• The chitinious inner linning of the gizzard has 6 powerful teeth.
• These teeth form an efficient grinding apparatus.
• Thus Gizzard acts as grinding mill and sieve.
• The membranous funnel projected into mesenteron from gizzard is called stomdeal valve.
• This valve prevents backward movement of food from mesenteron into gizzard.

❤. MIDGUT ( Mesenteron) ❤

• It is a short narrow tube.
• Anterior part of midgut contains 6 to 8 finger shaped diverticular called hepatic caecae.
• These are helpful in digestion and absorption of digested food material.
• The anterior part of midgut is secretory and posterior part is absorptive
• Secretory part secrets enzymes.
• The food bolus is surrounded by chitinious and porous peritrophic membrane which is secreted by midgut.
• It protects midgut wall from hard food particles.

❤. HINDGUT ( Proctodaeum) ❤

• It is a long coiled tube.
• The hindgut is divided into ileum , colon and rectum.
• There is a sphincter between mesenteron and hindgut.
• The sphincter prevents back movement of undigested food and uric acid from the hindgut to midgut.
• Ileum collects uric acid from Malpighian tubules which are present at the anterior end of ileum.
• colon is a long , coiled tube.It opens inti short and wider rectum which opens out through anus.
• Rectum has 6 longitudnal folds called rectal papillae .They absorb water from undigested food.
• Entire hind is internally lined by cuticle.

❤. DIGESTIVE GLANDS ❤

⭐. The digestive glands of cockroach includes

1. Salivary glands 2. Hepatic caecae. 3 Glandular cells of mesenteron.

❤. Salivary glands ❤

• A pair of salivary glands are present on either side of the crop.
• Each salivary glands has two lobes.
• Each lobe has many lobules called acini.
• Each acinus is made up of secretory cells called zymogen cells.
• All the zymogen cells are connected by ductules.
• The ductules open into a common salivart duct.The two common salivary ductus are joined to form the median salivary duct.
• There is a pair of salivary receptacles to store saliva.
• The receptular duct is connected to common receptacular duct.
• The median salivary duct is connected to common recptular duct to form an efferent salivary duct.
• The efferent salivary duct opens at the base of hypopharynx in mouth cavity.
• Saliva is secreted by zymogen cells which contains starch digesting enzymes amylase..

❤. Hepatic caecae ❤

• There are six to eight finger like diverticular called hepatic caecae which contains secretory and absorptive cells.

❤. Glandular cekms of Mesenteron ❤

• Glandular cells of mesenteron secrets maltase , invertase.