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Why Is The Pancreas Both An Endocrine And An Exocrine Gland?

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Chapter 23

The Endocrine System CHAPTER SUMMARY This chapter begins with an introduction to endocrine glands and a comparison of the roles of the nervous and endocrine systems. The distinction between endocrine and exocrine glands is described. The mechanism of action of hormones is explained. The major endocrine characteristics of the hypothalamus and pituitary gland, the thyroid gland, the parathyroid glands, the adrenal glands, the pancreas, the ovaries and testes, the pineal gland, and the thymus are described in detail. The secretions of other endocrine tissues are summarized. The development of the endocrine system is portrayed. The effects of aging on the endocrine system are explained. A glossary of key medical terms associated with the endocrine system is provided. This chapter concludes with a thorough study outline, an excellent self-quiz, critical thinking questions, and answers to questions that accompany chapter figures. STUDENT OBJECTIVES 1. Distinguish between exocrine glands and endocrine glands. 2. Describe how hormones interact with target-cell receptors. 3. Explain why the hypothalamus is an endocrine gland. 4. Describe the location, histology, hormones, and functions of t Continue reading >>

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    Why is the pancreas considered both an exocrine and endocrine gland?

    Why is the pancreas considered both an exocrine and endocrine gland?
    Anatomy & Physiology Nervous and Endocrine Systems Endocrine System

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    because they secrete digestive enzymes (exocrine function) and insulin (endocrine function)
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Pancreas

(redirected from Exocrine pancreas) Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia. Related to Exocrine pancreas: Exocrine pancreatic insufficiency, Endocrine pancreas pancreas [pan´kre-as] (pl. pancre´ata) (Gr.) a large, elongated, racemose gland located transversely behind the stomach, between the spleen and duodenum. (See also Plate 11.) It is composed of both exocrine and endocrine tissue. The acini secrete digestive enzymes, and small ductules leading from the acini secrete sodium bicarbonate solution. The combined product, pancreatic juice, enters a long pancreatic duct and from there is transported through the hepatic duct to the duodenum. The pancreatic juice contains enzymes for the breakdown of proteins, carbohydrates, and fats. The bicarbonate ions in the pancreatic secretion help neutralize the acidic chyme that is passed along from the stomach to the duodenum. Regulation of pancreatic secretion of enzymes and bicarbonate ions is both neural and hormonal; however, the influences of the hormones secretin and cholecystokinin are more important than vagal stimulation. The entry of chyme into the small intestine causes the transformation of an inactive proe Continue reading >>

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Digestive Glands

2006 Unit reviewed by: Edith Robbins Link to the Hippocrates module on DIGESTIVE GLANDS INTRODUCTION Most of the glands associated with the digestive tract are embryonic outgrowths of endoderm although in the stomodeal and proctodeal regions they are derived from ectoderm. This laboratory is concerned only with the gall bladder and the large, extramural glands such as liver, pancreas and the major salivary glands. The intramural glands are considered together with the digestive tract proper. The liver is the largest internal organ in the body and the most diverse in function. It serves as a major storage organ (e.g. glycogen) and has numerous metabolic functions. Furthermore, it is both an endocrine and an exocrine gland. As an endocrine gland the liver releases lipids, glucose, proteins, glycoproteins and glycolipids into the bloodstream. Major blood proteins such as albumin, fibrinogen, complement, transferrin, and the apoproteins of the lipoproteins, are synthesized and secreted by this organ. As an exocrine gland the liver secretes bile into a system of canaliculi and ducts convey their content to the gall bladder, where it is stored and concentrated, before release into the di Continue reading >>

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