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CCAC NRN 102 (Ch 8)
CCAC NRN 102 Genetics, Conception and Fetal Development
| Question | Answer |
|---|---|
| In Maternity care, when do genetics issues occur? | Before, during and after pregnancy. |
| What does Genetic testing involve? | Analysis of DNA, RNA, chromosomes, or proteins to detect abnormalities related to an inherited condition. |
| Decisions about genetic testing are shaped and in many instances contrained by what factors? | Social norms, where care is received, and socioeconomic status. Culture and ethnic differences also have a significant impact on genetic testing. |
| By what two methods are cells reproduced? | Mitosis and meiosis |
| By which type of reporuction of cells does the cell divide and decrease the number of chromosomes by half and give and example. | Meiosis, egg and sperm cells |
| ______________is the union of a single egg and sperm and marks the beginning of pregnancy. | Conception |
| Where does fertilization take place? | In the ampulaa( outer third) of the uterine tube. |
| How long are ova considered fertile? | Approximately 24 hours after ovulation. |
| How long do sperm remain viable within a woman's reproductive system? | 2 to 3 days |
| ______________is when the sperm penetrates the membrane surrounding the ovum. | Fertilization |
| When does implantation occur? | Between 6 and 10 days after conception. |
| What are the three primary germ layers? | Ectoderm, mesoderm, and endoderm |
| How long does pregnancy last? | 10 lunar months, 9 calendar months, 40 weeks, or 280 days. |
| Conception occurs how long after the LMP? | Approximately 2 weeks. |
| What are the three stages of intrauterine development? | Pre-embryonic, embryo, and fetus. |
| What is the amount of amniotic fluid at term? | 800 to 1200 ml |
| List 3 functions of amniotic fluid. | maintains body temperature, source of oral fluid, repository for wastes, cushions fetus from trauma, allows freedom of movement for musculoskeletal development, keeps fetus from tangling with the membranes. |
| Less than 300 ml of amniotic fluid. | Oligohydramnios |
| What is oligohydramnios associated with? | renal abnormalities |
| What is fluid volume greater than 2L associated with? | GI and other malformations |
| How many vessels make up the umbilical cord? | 2 arteries and 1 vein |
| When does the stage of the fetus begin? | 9 weeks |
| ____________is the capability of the fetus to survive outside the uterus. | Viability |
| What is the age of viability? | 22 weeks from the LMP or 20 weeks postconception with fetal weight of 500 gms. |
| What is the most critical pulmonary surfactant for postnatal lung expansion? | Lecithin |
| What pulmonary surfactant remains constant in the amount present in the amniotic fluid? | Sphingomyelin |
| What ratio of L/S indicates the infant's lungs are mature? | 2:1 |
| What part of fetal circulation allows blood to by-pass the lungs? | Ductus Arteriosus |
Created by:
JayneAnn
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