External link to single-dose applicators small enough to be carried in a small purse are available. Effectiveness of spermicides depends on consistent and accurate use. Not more than 1 hour before sexual intercourse

single-dose applicators small enough to be carried in a small purse are available. Effectiveness of spermicides depends on consistent and accurate use. Not more than 1 hour before sexual intercourse

the spermicide should be inserted high into the vagina so it makes contact with the cervix. Spermicide must be reapplied for each additional act of intercourse

External link to although irregular spotting is common in the first few months following insertion. The cumulative failure rate over 5 years of use is 1.1% (Rivlin & Westhoff

although irregular spotting is common in the first few months following insertion. The cumulative failure rate over 5 years of use is 1.1% (Rivlin & Westhoff

2017). IUDs offer constant contraception without the need to remember to take pills each day or engage in other manipulation before or between coital acts. If pregnancy can be excluded

External link to contraception

contraception

and effective birth control. Family planning is the conscious decision about when to conceive or to avoid pregnancy throughout the reproductive years. Contraception is defined as the intentional prevention of pregnancy during sexual intercourse. Birth control is the device and/or practice used to decrease the risk for conceiving or bearing offspring.

External link to Risk Reduction Efforts in Your Community The role of the fire officer has changed quite a bit over the last century. From a historic perspective, the fire department of the 20th Century has been retoo

Risk Reduction Efforts in Your Community The role of the fire officer has changed quite a bit over the last century. From a historic perspective, the fire department of the 20th Century has been retoo

Risk Reduction Efforts in Your CommunityThe role of the fire officer has changed quite a bit over the last century. From a historic perspective, the fire department of the 20th Century has been retooled into the ESO of today, and the organizational structure has expanded as well. Still, with all of these changes, the lines of authority have remained the same. Many of these changes […]

External link to and Fig. 6.9). The developing embryo draws the amnion around itself to form a fluid-filled sac. The amnion becomes the covering of the umbilical cord and covers the chorion on the fetal surface of the placenta. As the embryo grows larger

and Fig. 6.9). The developing embryo draws the amnion around itself to form a fluid-filled sac. The amnion becomes the covering of the umbilical cord and covers the chorion on the fetal surface of the placenta. As the embryo grows larger

the amnion enlarges to accommodate the embryo/fetus and the surrounding amniotic fluid. The amnion eventually comes in contact with the chorion surrounding the fetus (see the Critical Reasoning Case Study).

External link to bringing the connecting stalk to the ventral side of the embryo. The connecting stalk becomes compressed from both sides by the amnion and forms the narrower umbilical cord (see Fig. 6.7). Two arteries carry blood from the embryo to the chorionic villi

bringing the connecting stalk to the ventral side of the embryo. The connecting stalk becomes compressed from both sides by the amnion and forms the narrower umbilical cord (see Fig. 6.7). Two arteries carry blood from the embryo to the chorionic villi

and one vein returns blood to the embryo. Approximately 1% of umbilical cords contain only two vessels: one artery and one vein. This occurrence is sometimes associated with congenital malformations (Kaiser Permanente

External link to and certain maternal conditions such as diabetes and PKU (Box 6.2). A teratogen has the greatest effect on the organs and parts of an embryo during its periods of rapid growth and differentiation. This occurs during the embryonic period

and certain maternal conditions such as diabetes and PKU (Box 6.2). A teratogen has the greatest effect on the organs and parts of an embryo during its periods of rapid growth and differentiation. This occurs during the embryonic period

specifically from days 15 to 60. During the first 2 weeks of development

External link to depending on the number of genes for the defect present or the amount of environmental influence. A neural tube defect can range from spina bifida (a bony defect in the lumbar region of the vertebrae with little or no neurologic impairment) to anencephaly (absence of brain development

depending on the number of genes for the defect present or the amount of environmental influence. A neural tube defect can range from spina bifida (a bony defect in the lumbar region of the vertebrae with little or no neurologic impairment) to anencephaly (absence of brain development

which is always fatal). Some malformations occur more often in one sex. For example

External link to and CF

and CF

are autosomal recessive inherited disorders. IEMs occur when a gene mutation reduces the efficiency of encoded enzymes to a level at which normal metabolism cannot occur. Defective enzyme action interrupts the normal series of chemical reactions from the affected point onward. The result may be an accumulation of a damaging product

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