a short note on gizzard, salivary glands and digestive duct of cockroach
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The gizzard, also referred to as theventriculus, gastric mill, and gigerium, is anorgan found in the digestive tract of some animals, including archosaurs (pterosaurs,crocodiles, alligators, and dinosaurs, includingbirds), earthworms, some gastropods, somefish, and some crustaceans. This specializedstomach constructed of thick muscular walls is used for grinding up food, often aided by particles of stone or grit. In certain insectsand molluscs, the gizzard features chitinousplates or teeth.
salivary gland..........
The salivary glands in mammals are exocrine glands that produce saliva through a system of ducts. Humans have three paired major salivary glands (parotid, submandibular, andsublingual) as well as hundreds of minor salivary glands.[1] Salivary glands can be classified as serous, mucous or seromucous(mixed).
cockroach...,...
In the buccal cavity:
Digestion starts in the buccal cavity with the help of salivary amylase. Salivary amylase converts starch into sugar.
In the mesentron:
It acts like a stomach of human. Here digestive enzymes are poured by hepatic caeca. These digestive enzymes contain: gastric amylase, maltase, invertage tryptase and lipase.
The digestion of carbohydrates, proteins and fats is completed.
The digested food is reached in the haemocoel where some food is used to release energy for daily metabolic activities and extra digested food is stored in the form of glycogen, fats granules and protein granules in the heamocoel. From here it is transported to different body parts.
salivary gland..........
The salivary glands in mammals are exocrine glands that produce saliva through a system of ducts. Humans have three paired major salivary glands (parotid, submandibular, andsublingual) as well as hundreds of minor salivary glands.[1] Salivary glands can be classified as serous, mucous or seromucous(mixed).
cockroach...,...
In the buccal cavity:
Digestion starts in the buccal cavity with the help of salivary amylase. Salivary amylase converts starch into sugar.
In the mesentron:
It acts like a stomach of human. Here digestive enzymes are poured by hepatic caeca. These digestive enzymes contain: gastric amylase, maltase, invertage tryptase and lipase.
The digestion of carbohydrates, proteins and fats is completed.
The digested food is reached in the haemocoel where some food is used to release energy for daily metabolic activities and extra digested food is stored in the form of glycogen, fats granules and protein granules in the heamocoel. From here it is transported to different body parts.
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