0

Digestive II





  • Submandibular Gland
    • Mixed acini
      • Will see Serous demilunes (serous cap on a mucous acini)
  • Parotid Gland
    • Serous gland
      • Thus, only serous acini



4 Types of Glands of the Digestive Tract
  1. Salivary
  2. Pancreas
  3. Liver
  4. Gallbladder
These glands can be either Exocrine or Endocrine
  • Exocrine Gland
    • Excrete molecules through a duct to the surface

  • Endocrine Gland
    • Excrete molecules into the blood stream, then the blood stream takes this everywhere in the body
      • AKA, "ductless" glands
So let's look at the 4 types of Digestive Glands again and categorize them as either:
 Exocrine or Endocrine
  1. Salivary Gland = Exocrine
  2. Pancreas = Small Endocrine part, Mostly Exocrine
  3. Liver = Exocrine
  4. Gallbladder = Exocrine
The Pancreas has a small part which does endocrine (secretes into the blood stream), but it is mostly Exocrine. BTW, Thyroid and Pituitary Glands are also Endocrine (which is why they are in the Endocrine Notes and not Digestive).


Pancreas
  • Exocrine Pancreas part (most of the pancreas)
    • secretes digestive enzymes


  • Endocrine Pancreas part (only 1-2% of pancreas)
    • secretes hormones to regulate blood-glucose level



Gallbladder
Stores & concentrates bile (from the liver)


Liver
Secretes bile (and no hormones)
Degrades & detoxifies drugs, poison (alcohol), etc.
  • Blood flow into Liver
    • Portal vein--> Sinusoids --> Central vein --> Sublobular vein --> Hepatic Vein --> IVC
      • Portal vein = nutrient-rich blood (deoxygenated blood) + wastes, toxins, drugs
        • Supplies 75% of the blood to the liver
      • Hepatic vein = oxygenated blood from the aorta
        • Supplies 25% of blood to the liver
      • Blood from Portal & Hepatic veins meet in the liver sinusoid and mix
        • Blood now deoxygenated & leaves liver to go to the heart (right atrium) via Hepatic vein to Inferior Vena Cava (IVC)


No comments:

Post a Comment