Power poit chp11

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Power poit chp11

  1. 1. Chapter11 Endocrine System Suffixes
  2. 2. What can we find out about the suffix –crine? To generate and separate a substance from cell or bodily fluids, to generate or release by the process of secretions. apocrine": adjective: (of exocrine glands) producing a secretion in which part of the secreting cell is released with the secretion (Example: "Mother's milk is one apocrine secretion.")
  3. 3. The endocrine system is made up of glands that produce and secrete hormones, chemical substances produced in the body that regulate the activity of cells or organs. These hormones regulate the body's growth, metabolism (the physical and chemical processes of the body), and sexual development and function. The hormones are released into the bloodstream and may affect one or several organs throughout the body. Hormones are chemical messengers created by the body. They transfer information from one set of cells to another to coordinate the functions of different parts of the body. The major glands of the endocrine system are the hypothalamus, pituitary, thyroid, parathyroid, adrenals, pineal body, and the reproductive organs (ovaries and testes). The pancreas is also a part of this system; it has a role in hormone production as well as in digestion. The endocrine system is regulated by feedback in much the same way that a thermostat regulates the temperature in a room. For the hormones that are regulated by the pituitary gland, a signal is sent from the hypothalamus to the pituitary gland in the form of a "releasing hormone," which stimulates the pituitary to secrete a "stimulating hormone" into the circulation
  4. 4. . The stimulating hormone then signals the target gland to secrete its hormone. As the level of this hormone rises in the circulation, the hypothalamus and the pituitary gland shut down secretion of the releasing hormone and the stimulating hormone, which in turn slows the secretion by the target gland. This system results in stable blood concentrations of the hormones that are regulated by the pituitary gland
  5. 5. Exocrine glands are glands which produce secretions destined for the surface of an organ, as opposed to endocrine glands, which secrete compounds into the bloodstream. Some examples of exocrine glands include the mammary glands, sweat glands, and saliva glands, and numerous exocrine glands can also be found inside the body, facilitating processes such as digestion. Some glands are both endocrine and exocrine in nature, secreting hormones into the bloodstream along with compounds which reach the surface of the organ. Some exocrine glands secrete directly, but more commonly, their secretions are routed through ducts, which may be simple or compound. Simple ducts consist of a single duct, while compound ducts branch out, providing more coverage. The ducts can also twist and turn in a variety of ways which create a number of sub classifications based on the shape of the duct. The shape of the ducts can be discerned clearly with the use of magnification, and sometimes tracers or dyes can be utilized to make the ducts more clear. Some exocrine glands are classified as merocrine glands, in which intact cells produce secretions. By contrast, holocrine glands produce compounds by allowing their cells to break up to release the desired secretion, and apocrine glands release their cells along with the secretion, with cells budding off and being
  6. 6. ---emia Suffix meaning blood or referring to the presence of a substance in the blood. As for example, anemia (lack of blood) and hypervolemia (too high a volume of blood). The ending -emia is one of the building blocks derived from Greek (in this case) or Latin used to construct medical terms
  7. 7. What is pernicious anemia? Anemia is a condition in which the body does not have a sufficient number of red blood cells or hemoglobin. Hemoglobin is present within red blood cells and is important for carrying oxygen to all tissues of the body. In males, anemia is typically defined as hemoglobin level of less than 13.5 gram/100ml, while in women, a hemoglobin level of less than 12.0 gram/100ml is considered to be indicative of anemia. These definitions may vary slightly depending on the source and the laboratory reference used. Pernicious is a term that means destructive, injurious or deadly. Pernicious anemia is a disease where large, immature, nucleated cells (megaloblasts, which are forerunners of red blood cells) circulate in the blood, and do not function as blood cells; it is a disease caused by impaired uptake of vitamin B-12 due to the lack of intrinsic factor (IF) in the gastric mucosa. It was termed "pernicious" because before it was learned that vitamin B-12 could treat the
  8. 8. Anemia can result from disruptions in the production of red blood cells or hemoglobin as well as from an increased destruction of red blood cells or loss of blood. Pernicious anemia is due to an inability to absorb vitamin B-12 (also known as cobalamin or Cbl) from the gastrointestinal tract. Humans get vitamin B-12 from animal products; both meat and dairy products are dietary sources of vitamin B-12. The body is able to store vitamin B-12 for a long time, so inadequate dietary intake must persist for years before a true deficiency of vitamin B-12 is reached. Because of this, the symptoms of pernicious anemia usually do not appear for years. While pernicious anemia is most commonly diagnosed in adults with an average age of 60, a rare, congenital (inborn) type of pernicious anemia has been described. As with other causes of anemia, symptoms related to decreased oxygen-carrying capacity of the blood can include tiredness and shortness of breath. Vitamin B-12 deficiency also interferes with the
  9. 9. What is sickle cell anemia? Sickle cell anemia (sickle cell disease) is a disorder of the blood caused by an inherited abnormal hemoglobin (an oxygen-carrying protein within the red blood cells). The abnormal hemoglobin causes distorted (sickled) red blood cells. The sickled red blood cells are fragile and prone to rupture. When the number of red blood cells decreases from rupture (hemolysis), anemia is the result. This condition is referred to as sickle cell anemia. The irregular sickled cells can also block blood vessels causing tissue and organ damage and pain. Sickle cell anemia is one of the most common inherited blood anemias. The disease primarily affects Africans an African Americans. It is estimated that in the United States, some 50,000 African Americans are afflicted with the most severe form of sickle cell anemia. Overall, current estimates are that one in 1,875 U.S. African American is affected with sickle cell anemia.
  10. 10. Sickle cell anemia is inherited as an autosomal (meaning that the gene is not linked to a sex chromosome) recessive condition whereas sickle cell trait is inherited as an autosomal dominant trait. This means that the gene can be passed on from a parent carrying it to male and female children. In order for sickle cell anemia to occur, a sickle cell gene must be inherited from both the mother and the father, so that the child has two sickle cell genes. The inheritance of just one sickle gene is called sickle cell trait or the "carrier" state. Sickle cell trait does not cause sickle cell anemia. Persons with sickle cell trait usually do not have many symptoms of disease and have normal hospitalization rates and life expectancies. Sickle cell trait is present in some two million blacks in the United States (8% of the U.S. black population at birth). When two carriers of sickle cell trait mate, their offspring have a one in four chance of having sickle cell anemia. (In some parts of
  11. 11. Works Cited "Pernicious Anemia Symptoms, Causes, Diagnosis, Treatment, and Prevention on MedicineNet.com." MedicineNet. Trans. Robert Russell. N.p., n.d. Web. 11 July 2013. <http://www.medicinenet.com/pernicious_anemia/article.htm>. "Sickle Cell Anemia (Sickle Cell Disease) Causes, Diagnosis, Symptoms, Treatments on MedicineNet.com." MedicineNet. Trans. Robert Russell. MedicineNet, n.d. Web. 11 July 2013. <http://www.medicinenet.com/sickle_cell/article/htm>. "What Are Exocrine Glands?" What Are Exocrine Glands? Trans. Robert Russell. N.p., n.d. Web. 11 July 2013. <http://www.experts123.com/q/what-are-exocrine-glands.html>. "What Is the Endocrine System?" What Is the Endocrine System? Trans. Robert Russell. N.p., n.d. Web. 11 July 2013. <http://www.hormone.org/hormones-and-health/what-is-the-endocrine- system>. Website

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