Pancreatic Endocrine Cells Regulate
Blood Sugar Levels
The pancreas, which is both an exocrine gland and an en-
docrine gland, is located off the first section of the small
intestine, called the duodenum (Figure 9.12). Its exo-
crine function concerns digestion, which you will learn
more about in Chapter 14. In this chapter, we are con-
cerned with its endocrine functions, which occur in the
cells of the pancreatic islets, or islets of Langerhans.
The stru c tu re o f th e en d o crin e p an creas • Figure 9.12
The pancreas lies in the abdomen next to the small intestine.
Pancreas
Duodenum of small intestine
a.
Anterior
view
Pancreatic islet
200x
Blood capillary
Exocrine cells
Alpha cell
(secretes glucagon)
Beta cell
(secretes insulin)
Exocrine
cells
Beta cell
Alpha cell
Pancreas
Kidney
Abdominal aorta
Celiac trunk
Spleen
(elevated)
b.
Pancreatic
islet and surrounding acini
c. Pancreatic
islet and surrounding acini
266 CHAPTER 9
The Endocrine System
previous page 301 Craig Freudenrich, Gerard J  Tortora   Visualizing Anatomy and Physiology   2011 read online next page 303 Craig Freudenrich, Gerard J  Tortora   Visualizing Anatomy and Physiology   2011 read online Home Toggle text on/off