The major cell types and their arrangement within the pancreatic tissue are illustrated in the diagram above. There is both endocrine (the endocrine islets of Langerhans) and exocrine (the exocrine acini) tissue within the organ. What is the functional difference between endocrine and exocrine tissue in the pancreas? The exocrine part of the pancreas looks like little grape-like cell clusters, each called an acinus (plural = acini). These are located at the ends of small ducts that lead to the central pancreatic duct. These acinar cells secrete enzyme-rich pancreatic juice into these tiny ducts that merge into a central pancreatic duct that leads to the duodenum where the pancreatic juice is delivered. Acinar cells produce digestive enzymes that enter the local small ducts, which merge into the main pancreatic duct, and eventually deliver the enzymes to the duodenum. What do you think would happen if these small and larger ducts were blocked so that the digestive enzymes were unable to be delivered to the duodenum? Structure of the Pancreatic Acinar Cell RER Golgi Nucleus Lysosome Mitochondria Zymogen granules Condensing vesicles Duct lumen Look at these two images of an acinar cell in the pancreas. Identify as many structures as you can in both the TEM and in the
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The functional difference between endocrine and exocrine tissue in the pancreas is that endocrine tissue produces and secretes hormones (like insulin and glucagon) directly into the bloodstream to regulate blood sugar levels, while exocrine tissue produces and Show more…
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The pancreas Complete the following descriptions of the pancreas. The pancreas functions as an endocrine and exocrine gland because it is made of two types of tissues. The ________ tissue secretes digestive juices. Pancreatic islets are a(n) ________ tissue and composed of many cell types, three of which secrete important hormones. A cells secrete ________, B cells secrete ________, and D cells secrete ________. These hormones regulate blood glucose and the digestive processes. endocrine glucagon exocrine somatostatin insulin
Rachel G.
Match the following structures with the description and functions: mouth, liver, stomach, pancreas, small intestine, gallbladder, muscular wall of the small intestine, duodenum, pharynx. The liver is the largest internal organ which secretes bile, protects certain nutrients, and produces enzymes and an alkaline fluid that is secreted into the duodenum. The small intestine is a long tube where digestion of nutrients is completed and most of the nutrients are absorbed. Digestion of carbohydrates begins here. The stomach is where food enters and also churns, mixing food with acidic gastric juice. The gallbladder is a small sac which stores and concentrates bile. The duodenum is the final tubular region of the GI tract and absorbs water and salts. Match the following digestive enzymes with the substrates: salivary amylase, pepsin, lipase, pancreatic amylase, trypsin. Salivary amylase digests polysaccharides in the mouth. Pepsin digests proteins in the stomach. Lipase digests lipids in the small intestine. Pancreatic amylase digests polysaccharides in the small intestine. Trypsin digests proteins in the small intestine.
Adi S.
Before exploring the functions of the different cells and organs involved in digestion, you must first be able to use the vocabulary effectively. This activity asks you to place the correct term descriptions of the digestive processes, from the initial stages of digestion through elimination. Match the words in the left column to the appropriate blanks in the sentences on the right. Not all vocabulary terms will be used. View Available Hint(s) Reset Help brush border mastication epiglottis saliva ileocecal sphincter peristalsis esophagus bile pancreas 1. Food is propelled forward by rhythmic contractions called , which moves food down the esophagus and through the stomach. 2. The secretions called are produced in the glands located behind the tongue and contain the enzyme amylase to chemically digest carbohydrate. 3. During , teeth cut and grind food into smaller pieces as the tongue mixes them with saliva. 4. When fat enters the duodenum, the gallbladder secretes to break up the large fat globules. 5. Without the cartilage at the back of the tongue called the , food would enter the trachea during swallowing. 6. Chyme passes through the that connects the ileum with the ascending colon. 7. The bolus slides down this tube, called the , which connects the pharynx to the stomach. 8. This large gland, located near the stomach, releases digestive enzymes after a meal and also secretes insulin and glucagon to control blood glucose levels. This accessory organ is called the
Sukhwinder N.
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