1. Shortly after birth, which of the following happens in the infant\'s circulat
ID: 3517656 • Letter: 1
Question
1. Shortly after birth, which of the following happens in the infant's circulatory system?
A.) Blood pressure in both right and left atria decrease.
B.) Blood pressure in both right and left atria increase.
C.) Blood pressure in the right atrium decreases, whereas blood pressure in the left atrium increases.
D.) Blood pressure in the right atrium increases, whereas blood pressure in the left atrium decreases.
E.) Blood pressure in the right atrium increases, whereas blood pressure in the left atrium will not change.
2. Teratogens are
A.) genetic disorders of the uterus during pregnancy.
B.) genetic disorders of the fetal nervous system.
C.) bacteria that cause infection of the placenta during pregnancy.
D.) substances or influences that cause birth defects.
E.) substances or influences that cause miscarriages.
3. If levels of prolactin hormone are adequate for the stimulation of milk production, what prevents milk production from taking place during pregnancy?
A.) the absence of sensory feedback from suckling
B.) a lack of oxytocin release
C.) insufficient prolactin releasing hormone levels
D.) elevated estrogen and progesterone levels
4. Antioxidants eliminate free radicals by:
A.) giving them a second electron to complete an electron pair
B.) causing the free radical to be transported out of the cell.
C.) causing the free radical to bind to another free radical.
D.) prevent free radicals from forming in the first place.
Explanation / Answer
Answer-1-option b.at the birth umbilical artery and vein falls off,as a result pulmonary vascular resistance increases.this increase pressure is transmitted to the aorta,ventricles and atrium finally.
Answer-2-option-d.teratogens affect foetus in early part of pregnancy and can cause birth defect.example-phenytoin is a teratogenic drug.
Answer-3-option b.while prolactin causes milk synthesis,it is the oxytocin which causes ejection of the milk.
Answer-4-option a.antioxidants like vitamin a, vitamin c and vitamin e gives there electron to the free radical to deactivate it.
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