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Cardiopulmonary A&P
Cardiopulmonary A&P - Unit 1 Test
| Question | Answer |
|---|---|
| How is fluid removed from infants lungs during the first 24 hours? | - squeezed out the lungs as infant passes through birth canal. - adsorbed by the pulmonary capillaries. - removed by lymphatic system. |
| 3 Factors for the difference between maternal & fetal PO2? | - the placenta itself is an actively metabolizing organ. - the permeability of the placenta varies from region to region with respect to resp gases - there are fetal and maternal shunts. |
| Oxygenated Fetal Blood | Oxygenated fetal blood is PO2 30mmhg and PCO2 40mmhg. |
| How does O2 transfer from mom to fetal blood & why does it? | - transfers because maternal/fetal PO@ gradient (O2 transfer from high to low pressure) - higher hemoglobin & greater affinity of fetal hemoglobin - while maternal )2 is moving into fetal blood ; CO2 is moving out of the fetal into mom. |
| What is the maternal PO2 in mom? | 80 to 100mmhg |
| What is the maternal PCO2 in mom? | 33mmhg because of hyperventilation - infant growing restricts her diaphragm so resp rate must increase. |
| Deoxygenated blood is carried from fetus by? | 2 umbilical arteries (PO2 in the arteries is 20 mmhg & PCO2 55mmhg) |
| Oxygenated fetal blood flows out of the chorionic villi & returns to the fetus by? | 2 umbilical veins |
| Describe the placenta. | consists of about 15 to 20 segments called cotyledons. |
| What are cotyledons function in the placenta? | They provide an interface between the maternal and fetal circulation. They are composed of fetal vessels, chorionic villi & intervillous spaces. |
| What are the stages of fetal lung development? | - embryonic, pseudoglandular, canalicular, terminal sac, and alveolar. |
| Describe embryonic period. | 26th day - lungs first appear as small buds. |
| Describe pseudoglandular. | - 6th & 16th week. goblet cells appear in trachea. mucous gland aslo appears. - by week 16, 20 generations of airway present (adult lung 28 gen) |
| Describe terminal sac. | 26th and continue until term. Type 1&2 cells alveolar can be seen & pulmonary surfactant begins to appear. |
| Describe alveolar. | - 32 week and through childhood (8-10 years) - 26th & 28th week air blood interface & quantity of pulmonary surfactant are usually sufficient to support life. |
Created by:
asiap23
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