OB MCCN Exam Questions with Complete Solutions, Rated A+

Trimesters - cORRECT sOLUTION 1st: weeks 1-13 2nd: weeks 14-26 3rd: weeks 27-40 EDC - cORRECT sOLUTION estimated date of confinement Implantation - cORRECT sOLUTION site: a/p region of fundus implantation bleed- mistaken for period b/c it happens at day 24-26 menstrual cycle Stages of Prenatal Development - cORRECT sOLUTION ovum- conception-day 14 embryonic- day 15- end of wk 8 fetal- wk 9 end of preg Embryonic Milestones - cORRECT sOLUTION day 21- neural tube close day 22- heart begins to beat day 24- limbs begin to develop day 28- eye and ear tissue, urethral buds, gi structures Teratogenics - cORRECT sOLUTION C: benefits outweigh risk D: use in life-threatening situations X: Contraindication- DO NOT USE Folic acid deficiency - cORRECT sOLUTION neural tube defects, facial abnormalities Tegritol- folate antagonist fetal circulation - cORRECT sOLUTION Cardiac System - cORRECT sOLUTION 1st organ system to function in IU life Fetal Heartbeat- 110-160 Resp. System - cORRECT sOLUTION Aveolar and Cap. formation- wk 24 Surfactant- L/S one of the last systems to develop Neuro System - cORRECT sOLUTION Embryonic stage: wk 5 forebrain, midbrain and hindbrain, brainwaves notes on EEG by wk 8 Fetal stage: 24 weeks respond to sound, 36 weeks sleep/wake cycle established GI system - cORRECT sOLUTION Meconium- forms in intestines @ wk 16 Vitamin K- important for clotting (give injection after birth) fetal membranes - cORRECT sOLUTION chorion: outermost membrane, covers the amnion and adheres to the uterine wall amnion- membrane in direct contact w/ amniotic fluid (origin of prostaglandin) Placenta - cORRECT sOLUTION 15-50 cm @ term 2-3 cm depth, comparable to size of baby growth complete by 12th week Umbilical Cord - cORRECT sOLUTION length at term- 55 cm, 2 cm diameter circulatory pathway Components: 2 arteries, 1 vein, wharton's jelly amniotic fluid - cORRECT sOLUTION Amount: increases with gestation, average 700-1000 ml at term Origin: diffusion from maternal system in beginning, @ 20 wks baby's urine helps maintain Renewal: constantly renewing PH: alkaline (helps to rule out ROM) function of amniotic fluid - cORRECT sOLUTION creates bouyance for cord, protects against extreme temp change, promote musculoskeletal growth, protects from minor trauma Stimuli for newborn respiration via lungs - cORRECT sOLUTION Sensory- lights, temp, cold room biochemical- increase CO2, decrease O2 mechanical- squeeze through birth canal