Class 11 Biology Digestion Absorption Digestive glands

Digestive glands

  • The digestive glands associated with the alimentary canal include the salivary glands, the liver and the pancreas.
  • Saliva is mainly produced by three pairs of salivary glands
  • the parotids (cheek)
  • the sub-maxillary/sub-mandibular (lower jaw)
  • the sublinguals (below the tongue).
  • All three glands situated just outside the buccal cavity secrete salivary juice into the buccal cavity.
  • Liver is the largest gland of the body weighing about 1.2 to 1.5 kg, situated in the abdominal cavity and has two lobes
  • The hepatic lobules are the structural and functional units of liver containing hepatic cells arranged in the form of cords.
  • Each lobule is covered by a thin connective tissue sheath called the Glisson’s capsule.
  • The bile secreted by the hepatic cells passes through the hepatic ducts and is stored and concentrated in a thin muscular sac called the gall bladder.
  • The duct of gall bladder (cystic duct) along with the hepatic duct from the liver forms the common bile duct.
  • The bile duct and the pancreatic duct open together into the duodenum as the common hepato-pancreatic duct which is guarded by a sphincter called the sphincter of Oddi.
  • The pancreas is a both exocrine and endocrine gland situated between the limbs of the ‘U’ shaped duodenum.
  • The exocrine portion secretes an alkaline pancreatic juice containing enzymes and the endocrine portion secretes hormones, insulin and glucagon.

Class_11_Biology_Digestive_System_The_Duct_System

Fig. The duct system

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