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Clinical Significance the finding of a positive reagent strip test result for blood indicates the presence of red blood cells symptoms 3 weeks pregnant buy discount zofran, hemoglobin treatment yersinia pestis best zofran 8mg, or myoglobin treatment 5cm ovarian cyst buy zofran 4 mg visa. Reagent Strip Reactions Chemical tests for blood use the pseudoperoxidase activity of hemoglobin to catalyze a reaction between the heme component of both hemoglobin and myoglobin and the chromogen tetramethylbenzidine to produce an oxidized chromogen, which has a green-blue color. H2O2 + chromogen Hemoglobin Peroxidase Hematuria Hematuria is most closely related to disorders of renal or genitourinary origin in which bleeding is the result of trauma or damage to the organs of these systems. Major causes of hematuria include renal calculi, glomerular diseases, tumors, trauma, pyelonephritis, exposure to toxic chemicals, and anticoagulant therapy. The laboratory is frequently requested to perform a urinalysis when patients presenting with severe back and abdominal pain are suspected of having renal calculi. In such cases, hematuria is usually of a small to moderate degree, but its presence can be essential to the diagnosis. Hematuria of nonpathologic significance is observed following strenuous exercise and during menstruation. It also may result from intravascular hemolysis and the subsequent filtering of hemoglobin through the glomerulus. Lysis of red blood cells in the urine usually shows a mixture of hemoglobinuria and hematuria, whereas no red blood cells are seen in cases of intravascular hemolysis. Under normal conditions, the formation of large hemoglobin-haptoglobin complexes in the circulation prevents the glomerular filtration of hemoglobin. When the amount of free hemoglobin present exceeds the haptoglobin content-as occurs in hemolytic anemias, transfusion reactions, severe burns, brown recluse spider bites, infections, and strenuous exercise- hemoglobin is available for glomerular filtration. After mixing and allowing the specimen to sit for 5 minutes, the urine is filtered or centrifuged, and the supernatant is tested for a reaction for blood with a reagent strip. The principle of this screening test is based on the fact that the larger hemoglobin molecules are precipitated by the ammonium sulfate, and myoglobin remains in the supernatant. Therefore, when myoglobin is present, the supernatant retains the red color and gives a positive reagent strip test for blood. Conversely, hemoglobin produces a red precipitate and a supernatant that tests negative for blood. Sensitivity Interference Reagent strip manufacturers incorporate peroxide, and tetramethylbenzidine, into the blood testing area. In the presence of free hemoglobin/myoglobin, uniform color ranging from a negative yellow through green to a strongly positive green-blue appears on the pad. In contrast, intact red blood cells are lysed when they come in contact with the pad, and the liberated hemoglobin produces an isolated reaction that results in a speckled pattern on the pad. Reagent strip tests can detect concentrations as low as five red blood cells per microliter; however, care must be taken when comparing these figures with the actual microscopic values, because the absorbent nature of the pad attracts some of urine. The terms trace, small, moderate, and large or trace, 1+, 2+, and 3+ are used for reporting. Correlations with other tests Reaction Interference False-positive reactions due to menstrual contamination may be seen. They also occur if strong oxidizing detergents are present in the specimen container. Vegetable peroxidase and bacterial enzymes, including an Escherichia coli peroxidase, may also cause false-positive reactions. Therefore, sediments containing bacteria should be checked closely for the presence of red blood cells.
Ovarian Follicles Each ovarian follicle passes through various maturational stages medicine cabinets with mirrors zofran 4 mg mastercard, from the primordial follicle (or non-growing follicle) symptoms emphysema order zofran with a visa, through the growing follicles which have four stages treatment 1860 neurological discount 4mg zofran mastercard, namely, unilaminar primary, multilaminar primary, secondary, and, finally, the Graafian (mature) follicle (see Table 17-1). Filopodia of the follicular cells adjacent to the zona pellucida and the microvilli of the primary oocyte contact and form gap junctions with each other in the zona pellucida. The connective tissue stroma coalesces around the follicular cells but is separated from them by a basement membrane. This connective tissue layer is the theca folliculi and has two layers, a cellular theca interna adjacent to the basement membrane and a fibromuscular theca externa, surrounding the theca interna. At this point, the entire structure is known as a secondary follicle, and it presents a welldeveloped zona pellucida, as well as a clearly distinguishable basement membrane that is interposed between the follicular cells and the highly cellular theca interna the theca interna is surrounded by a more fibrous theca externa. This large structure is characterized by a follicular fluid containing the central antrum, whose wall is composed of the membrana granulosa (follicular cells are also known as granulosa cells). Jutting into the antrum is the cumulus oophorus, housing the primary oocyte and its attendant zona pellucida and corona radiata. The membrana granulosa is separated from the theca interna by the basement membrane. Several Graafian follicles develop during an ovulatory cycle, but (usually) only one will release its oocyte and that is known as the dominant (Graafian) follicle. Locally produced prostaglandins stimulate smooth muscle cells of the theca externa to undergo contraction thus assisting in ovulation. In this case, the corpus luteum is known as the corpus luteum of menstruation and will degenerate into the corpus albicans. In case pregnancy does occur, the syncytiotrophoblasts of the forming placenta Corpus Luteum and Corpus Albicans Once the Graafian follicle loses its oocyte, it becomes transformed into the corpus hemorrhagicum. A few months into the pregnancy, when the placenta has been well established, the corpus luteum, known as the corpus luteum of pregnancy, is no longer needed, and it also undergoes luteolysis to form the fibrotic corpus albicans. Fundus and Body of the Uterus the uterus is composed of a thick, muscular myometrium (covered by serosa and/or adventitia) and a spongy mucosal layer, the endometrium. The basal layer, which remains intact during menstruation, is served by short, straight arteries and is occupied by the base of the uterine glands. The functional layer, served by the helicine (coiled) arteries, undergoes hormonally modulated cyclic changes during the menstrual cycle of a postpubertal and premenarche female. The three phases of the endometrium during the menstrual cycle are the proliferative, secretory, and menstrual phases (see Table 17-2). Additionally, the helical arteries become more coiled, and fibroblasts of the stroma accumulate glycogen and fat. It should be understood that the basal layer is unaffected because it is being supplied by the straight arteries. The mucosa of the oviduct, composed of a simple columnar epithelium and a vascular lamina propria, is extensively folded in the infundibulum and ampulla, but the folding is reduced in the isthmus and intramural portions. Their apical region is expanded and houses the secretory product that these cells release, namely: factors for the capacitation of spermatozoa and nutrient-rich medium that nourishes the spermatozoa as well as the fertilized ovum traveling toward the uterus. The mucosa is surrounded by a thick smooth muscle coat composed of a poorly defined inner circular and outer longitudinal layers, which, via peristaltic action, assists the cilia to propel the fertilized egg to the uterus. The muscular coat of the oviduct is covered by a serosa, whereas its intramural portion is embedded in the uterus and is surrounded by uterine connective tissue. Uterus the uterus, a pear-shaped viscus, is divisible into a fundus, body, and cervix.
They no longer contain secretory granules symptoms 24 hours before death zofran 8 mg with mastercard, and their microvilli become elongated and are known as brush cells medicine and science in sports and exercise purchase 8mg zofran visa. They may be recognized by the filamentous structures within the supranuclear cytoplasm medicine jokes buy zofran 4 mg amex. The pseudostratified ciliated columnar epithelium of the trachea is composed of several types of cells, some of which are presented here. Each cilium, some of which are seen in cross section, displays its plasma membrane and its axoneme (A). This electron micrograph represents a thin section of an intercellular canaliculus between clear cells of a human eccrine sweat gland stained with ferrocyanide-reduced osmium tetroxide. This is a freeze fracture replica of an elaborate tight junction along an intercellular canaliculus between two clear cells. Note the smooth transition from a region of wavy, nonintersecting, densely packed junctional elements to an area of complex anastomoses. At the step fracture (arrows), it can be seen that the pattern of ridges on the E-face corresponds to that of the grooves on the P-face of the plasma membrane of the adjacent clear cell. In certain areas (arrowheads), several of the laterally disposed, densely packed junctional elements are separated from the luminal band. Goblet cells are unicellular exocrine glands that are found interspersed among simple columnar and pseudostratified columnar epithelia. The brush border (arrowhead) of the columnar cells is only scantly present on the goblet cells. The expanded apical region of the goblet cell is known as the theca (T) and is filled with mucin (m), which, when released into the lumen of the gut, coats and protects the intestinal lining. The lower right-hand corner of the simple columnar epithelium was sectioned somewhat obliquely through the nuclei of the epithelial cells, producing the appearance of a stratified epithelium (asterisk). Looking at the epithelium above the double arrows, however, it is clearly simple columnar. The occasional round nuclei (rN) are those of lymphocytes migrating through the epithelium into the lumen (L). This photomicrograph is a higher magnification of the boxed area of the previous figure, demonstrating the light microscopic morphology of the goblet cell. The mucin (m) in the expanded theca (T) of the goblet cell has been partly precipitated and dissolved during the dehydration procedure. The nucleus (N) of the goblet cell is relatively dense due to the condensed chromatin. The terminal web and brush border of the goblet cell are greatly reduced but not completely absent (arrowheads). The round nuclei (rN) belong to leukocytes migrating through the epithelium into the lumen (L) of the ileum. They discharge their sebum into the follicle, although in certain areas of the body they are present independent of hair follicles. These glands, surrounded by slender connective tissue capsules (Ca), are pear-shaped saccules with short ducts. Each saccule is filled with large, amorphous cells with nuclei in various states of degeneration (arrows). As the cells move away from the periphery of the saccule, they enlarge and increase their cytoplasmic fat (f) content.
The white spaces among the fibers represent the loose connective tissue elements that remain unstained symptoms vitamin d deficiency buy generic zofran 4mg line. A transverse section of dense regular elastic connective tissue displays a characteristic appearance medications to treat anxiety buy zofran no prescription. In some areas the fibers present precise cross-sectional profiles as dark dots of various diameters (arrows) symptoms high blood sugar zofran 4 mg without prescription. Other areas present oblique sections of these fibers, represented by short linear profiles (arrowhead). As in the previous figure, the white spaces represent the unstained loose connective tissue elements. Since these sheet-like membranes wrap around within the wall of the aorta, in transverse sections they present discontinuous, concentric circles, which in this photomicrograph are represented by more or less parallel, wavy, dark lines (arrows). Also present are fibroblasts and smooth muscle cells, whose nuclei may be discerned. Mast cells are very common components of the subepithelial connective tissue (lamina propria) of the digestive tract, Figure 4b (Jejunum. The denser, more amorphous nuclei (arrows) belong to lymphoid cells, migrating from the connective tissue into the intestinal lumen. Plasma cells are characterized by clock face ("cartwheel") nuclei, as well as by a clear paranuclear Golgi zone (arrowhead). These cells appear as dense, black structures in the liver sinusoids; vascular channels are represented by clear areas (arrow). This electron micrograph of fibroblasts (F) demonstrates that they are long, fusiform cells whose processes (p) extend into the surrounding area, between bundles of collagen fibrils. These cells manufacture collagen, reticular and elastic fibers, and the ground substance of connective tissue. Note that the bundles of collagen fibrils (Cf) are sectioned both transversely (asterisk) and longitudinally (double asterisks). Individual fibrils display alternating transverse dark and light banding (arrows) along their length. The specific banding results from the ordered arrangement of the tropocollagen molecules constituting the collagen fibrils. This electron micrograph of a rat peritoneal mast cell displays characteristics of this cell. Note that the nucleus (N) is not lobulated, and the cell contains organelles, such as mitochondria (m) and Golgi apparatus (G). Observe that the most characteristic component of this cell is that it is filled with numerous membrane-bound granules (Gr) of more or less uniform density. These granules contain heparin, histamine, and serotonin (although human mast cells do not contain serotonin). Additionally, mast cells release a number of unstored substances that act in allergic reactions. Mast cells possess receptor molecules on their plasma membrane, which are specific for the constant region of IgE antibody molecules. These molecules attach to the mast cell surface and, as the cell comes in contact with those specific antigens to which it was sensitized, the antigen binds with the active regions of the IgE antibody. Granules at the periphery of the cell are released by fusion with the cell membrane, whereas granules deeper in the cytoplasm fuse with each other, forming convoluted intracellular canaliculi that connect to the extracellular space. Such a canaliculus may be noted in the bottom left-hand corner of this electron micrograph.
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