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Describe the common tissues found in the organs of the intestinal tract. (4 points) Describe the common tissues and structures found in accessory organs. (4 points) Describe these structures and their function in the pancreas: (6 points) Acinar cells that secrete enzymes or bicarbonate _____ Islet cells that secrete insulin or glucagon ____ Blood vessel ______ Describe these structures and their function in the small intestine: (6 points) Villi _____ Smooth muscle ______ Intestinal glands _______

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arsilan324

Answer:

1)

Tissues in the intestinal tract made up of loose connective tissues

Mucosa: It playa a role in the secretion of lubricants that lubricate and protect the intestinal wall from digestive enzymes.

Submucosa: It contains nerves, blood vessels and elastic fibers with collagen. It maintains the shape of the intestine by stretching.

Serosa: During digestive movements, it secretes lubricating fluid and prevents from frictional damages.

2)

Accessory digestive organs have common specialized cells, ducts, and secrete digestive hormones to help in digestion.

3)

Acinar cells that secrete and transport enzymes or bicarbonate into the duodenum for the digestion of the food.

Islet cells that secrete insulin or glucagon that increase the glucose level in the blood.

Blood vessels provide oxygen and nutrients for tissue growth and maintenance.

4)

Villi help to absorb digested food.

Smooth muscle moves food through the digestive tract.

Intestinal glands help in digestion and absorption by releasing hormones.

luisvaschetto

Acinar cells are basic units of the exocrine pancreas, islets are clusters of cells, and blood vessels maintain pancreatic islets. Villi are projections of the small glandular intestine, whose contraction is due to smooth muscle.

  • The acinar cells represent the functional basic units of the exocrine pancreas.

  • These cells (acinar cells) secrete digestive enzymes called zymogens, which activate when they reach the duodenum.

  • Islets cells are groups of cells within the pancreas that perform specific functions.

  • For example, islets of beta cells, are pancreatic islets involved in the production of insulin, a hormone required to control the level of glucose in the blood.

  • These pancreatic islets are vascularized by many blood vessels, which are adapted in order to favor normal endocrine function.

  • Intestinal microvilli are finger-like projections of the intestinal surface cells, which are capable of increasing the internal surface area, thereby increasing absorption.

  • The smooth muscle tissue found in intestinal walls is responsible for the rhythmic involuntary contractions of the intestine.

  • Intestinal glands are tubular glands localized in the small intestine between the villi, which are capable of secreting digestive enzymes and mucus.

  • There are two classes of intestinal glands: crypts of Lieberkuhn and Brunner's glands.

In conclusion, acinar cells are units of the exocrine pancreas, islets are clusters of cells, and blood vessels maintain pancreatic islets. Villi are projections of the small glandular intestine, whose contraction is due to smooth muscle.

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