endocrine toxicology the female reproductive system

... is the term used for the release of the mature ovum from the ovary into the second part of the female reproductive system, the oviduct The ovum, which is enclosed in a sac, ruptures along the ... time they devote to caring for their offspring depends on whether they are precocial or altricial, with the latter requiring more post-hatch parental care The female reproductive system of the ... yolks The color of the yolks from these hens can be ‘improved’ by the addition of marigold petals to provide the desired level of xanthophylls in the yolk The first part of the oviduct, the infundibulum...

Ngày tải lên: 13/02/2014, 16:20

... al 2005a) is therefore common among the social Hymenoptera In these species, the process of testis degeneration begins after the migration of the spermatozoa to the seminal vesicles The same process ... North American species (Dirks and Sternburg 1972) In the present work, the morphology of the male reproductive system, the spermatozoa and the number of spermatozoa per cyst were described for ... Histology of the male reproductive system of Polistes vesicolor D-E Photomicrograph of the spermatozoa and of the nucleus stained with DAPI, respectively A Longitudinal section from the region of the...

Ngày tải lên: 14/03/2014, 16:20

... male reproductive system of the adult rat To identify the cells responsible for GSSG reduction, an attempt was made to determine the localization of GR in the male reproductive system of the rat ... localization in the male reproductive system of the adult rat (Fig 2) Epithelia from the epididymis, vas deferens, seminal vesicles, and prostate glands were strongly stained with the GR antibody In the ... expected that the reductant level inside the epididymis would be low However, we found a high level of GR in the epithelia of the epididymis (Fig 1) As the epididymis is rich in sulfoxidase, the oxidation...

Ngày tải lên: 17/03/2014, 17:20

... Prostaglandins in semen: • Decrease the viscosity of mucus in the cervix • Stimulate reverse peristalsis in the uterus • Facilitate the movement of sperm through the female reproductive tract • Clotting ... Bulbourethral • Ejaculatory duct • Urethra • Penis Male Reproductive Anatomy The Male Reproductive System in Anterior View The Structure of the Testes Spermatogenesis • Takes about 74 days • Seminiferous ... it either binds to androgen receptor or converted to DHT which then binds to the androgen receptor • Testosterone targets all reproductive and accessory organs and its deficiency causes these...

Ngày tải lên: 28/03/2014, 14:20

... In the light microscope the spermatozoon appears to have only two parts: the head and the tail In the electron microscope, the tail can be subdivided further into the neck, the middle piece, the ... migrate in embryonic life to the gonadal ridges They comprise the bulk of the cells in the adult seminiferous tubule These form the other major category of cell types in the seminiferous tubules ... of the future sperm head The Cap Phase The acrosomal vesicle grows and forms the head cap that covers the anterior two third of the nucleus The two centrioles assemble at the caudal pole of the...

Ngày tải lên: 28/03/2014, 16:20

... covering epithelia found in the male reproductive systems of horses [9], bulls [1], and rats [2] The present study is largely consistent with these studies There is a general agreement that in the thoroughbred ... is different The functional role of each lectin needs further study Taken together, these results suggest that covering epithelia have a specific glycoprotein in the reproductive system of male ... in the horse, some lectins are involved in cell degeneration, either as a cause or a consequence Additionally, the heterogeneity of the lectin staining patterns in the reproductive tubules of the...

Ngày tải lên: 07/08/2014, 17:22

... anesthesia was performed under supervision of an attending anesthesiologist Fentanyl was the only analgesic to be used during surgery, with the final dose being given ≥30 before the end of the ... designed the study and provided statistical analysis; ESS coordinated the study and drafted the manuscripts References A possible explanation for these observations may be found in the details of the ... used to deliver another ml of solution between the internal oblique and transversus abdominis muscles The second component of the IINB was administered by injecting ml of the same solution after...

Ngày tải lên: 11/08/2014, 07:21

... Marijuana Effects on the Endocrine and Reproductive Systems ACKNOWLEDGMENT This monograph is based upon papers and discussion from the RAUS Review Conference on the Endocrine and Reproductive Effects ... take place at the review meeting, make up a RAUS Review Report in the NIDA Research Monograph series v The subject of the effects of marijuana on the endocrine and reproductive systems was chosen ... of their reproductive systems at about the same time as they are likely to begin using marijuana Since there is a growing body of research on the subject, it became incumbent upon NIDA to gather...

Ngày tải lên: 22/03/2014, 12:20

... required extended parental care The adaptivemenopause hypothesis assumes that females actively enhancethe fitnessof post -reproductive their prior offspring and their young (Williams 1957, Hamilton ... Ps,t) where PM,t is the probability that a female will be matureby age t andPs,tis the probability reproductively senescentby age t It thata female will be reproductively thata female is not follows ... binomialrandomvariable,such that E(NR,,)= Ntpt whereNt is the total numberof females of age t andPt is the probabilitythat a female of age t is reproductively 112 * REPRODUCTIVE MATURATION AND SENESCENCE Schwartz...

Ngày tải lên: 05/03/2014, 17:20

... helpful to understand how the female reproductive system works The main reproductive tissues in women are the ovaries, uterus, and fallopian tubes The functions of these tissues are largely controlled ... nutrients from the mother to the fetus During the first months of pregnancy (first trimester), the major fetal organs are formed During the remainder of the pregnancy, these organs mature and the fetus ... in the mother’s blood, pass through the placenta, and reach the developing fetus Other hazardous agents can affect the overall health of the woman and reduce the delivery of nutrients to the...

Ngày tải lên: 14/03/2014, 16:20

... 1979) The start of the maturation stage is indicated by the migration of the nucleus to the animal pole When the nucleus has completed its migration, the first meiotic division takes place The ... organelles in the cytoplasm is characteristic of the cortical alveoli stage and indicates that the oocytes will normally continue their development through the remaining stages within 25 the current ... 1997) Additionally, the female contributes nourishment to the developing embryo and thus at least during the very early life stages the maternal role is more important than the paternal role in...

Ngày tải lên: 22/03/2014, 12:20

... the corona radiata) around the oocyte The midpiece of the sperm is derived from the mitochondria and other metabolic organelles of the cell, and the flagellum is derived from the centrioles The ... female oocyte The nucleus of the cell becomes the head of the sperm, and the lysosomes become the acrosome (See Figure 28.9) The acrosome contains digestive enzymes in order to digest the cumulous ... in the epididymis In spermiogenesis all non-essential components of the spermatids are lost in order that the sperm have only the chromosomes and the machinery required to propel them to the female...

Ngày tải lên: 28/03/2014, 14:20

... trophoblast and endometrum which is now called the chorion •Chorionic villi contact maternal blood supply •becomes an endocrine gland: •HCG (similar to LH) maintains the CL for months •Later, estrogen and ... occur in men Breast cancer is the most common type of cancer in women and is the second leading cause of death by cancer in women, following only lung cancer In 2000, the American Cancer Society ... new cases of breast cancer were diagnosed in the United States The average woman at age 30 years has chance in 280 of developing breast cancer in the next 10 years This chance increases to in...

Ngày tải lên: 03/07/2014, 05:20

... of age The dose volume was 1.5 ml/kg B.W The animals were sacrificed on the next day of final treatment Pathological evaluations: On the sacrifice day, rats were anesthetized using ethyl ether ... the seminal vesicle of rats, that is, the vesicles were narrowed and occupied with epithelial cells (Fig 4) The treatment of methyltestosterone did not show any histopathological changes in the ... magnification, ×40 Effects of tributyltin chloride on the reproductive system in pubertal male rats 33 Fig The changes in serum testosterone levels in the male rat following daily oral treatments with...

Ngày tải lên: 07/08/2014, 17:22

... on the reproductive system, our results suggest that daily intake of genistein has no observable detrimental effects on male reproductive system The present study extend our knowledge of the ... Meanwhile, data for the exposure to genistein at adult stage is very limited The objective of the present study was to evaluate whether genistein causes adverse effects on reproductive system as exposed ... epididymis, and prostate using the TRIzol reagent (Life Technologies, Gaithersburg, MD, USA), according to the manufacturer’s instruction [22] The RNA pellet obtained in the final step was dissolved...

Ngày tải lên: 07/08/2014, 18:20

... What Is the Reproductive System? CH A P T E R   The Parts of the Reproductive System 15 CH A P T E R   How the Reproductive System Works 35 CH A P T E R   Problems with the Reproductive ... What Is the Reproductive System? T he reproductive system refers to those parts of the body that are necessary to create a baby Unlike other systems of the body— such as the respiratory system, ... surround the opening of the vagina They include a pair of skin folds nearest the vagina called the 24 The Pa r ts of the Repro ductive System Female genitalia, such as the labia, help to protect the...

Ngày tải lên: 11/01/2015, 16:11

... SECTION ENDOCRINE SYSTEMS AND THE HYPOTHALAMIC–PITUITARY AXIS • ENDOCRINE SYSTEMS AND THEIR IMPORTANCE IN DISEASE • BASIC PRINCIPLES OF CLINICAL ENDOCRINOLOGY • MICROSTRUCTURE OF THE ENDOCRINE SYSTEM ... in the plasma Draw a diagram that illustrates the integration of the nervous and hormonal control systems in the body Briefly outline the concept of feedback control Endocrine systems and the ... an example They bind to a receptor in the cytoplasm or nucleus They exert their effects via a second messenger mediated system They affect the rate of transcription of specific genes They are secreted...

Ngày tải lên: 19/03/2016, 23:17

... applied to intact skin [22] The dose of drug delivered depends on the surface area of the patch and the length of time that the patch is worn, which allows for tailoring the duration of medication ... transdermal system; ADHD = attention-deficit/hyperactivity disorder phase or, if in the investigator's opinion there was potential for further symptom reduction, try the next higher dose No further ... answered by the subject's caregiver Not all items and scales were utilized in the study (refer to the Appendix 1) The AIM-C was completed by the subject's caregiver at baseline and at week The MSS...

Ngày tải lên: 25/10/2012, 10:06

... management system and to continually improve the effectiveness of the quality management system They also have to define their roles in maintaining and developing quality management system in company Their ... to implement the process of the quality management system of the company based on the voluntary and self-control spirit The regular discussions among them will contribute to enhance the effectiveness ... management system There are eight quality management principles on which the quality management system standards of the ISO series are based These principles have been identified to facilitate the achievement...

Ngày tải lên: 18/04/2013, 17:09