After teaching a pregnant woman about the hormones produced by the placenta, the nurse determines that the teaching was successful when the woman identifies which hormone produced as being the basis for pregnancy tests?

Choice A reason:

Basal metabolic rate reduction. This is incorrect because a newborn under a radiant heat warmer will have an increased basal metabolic rate, not a reduced one. The basal metabolic rate is the amount of energy the body uses at rest, and it is influenced by temperature. A warmer environment will stimulate the newborn's metabolism and increase the energy expenditure. • Choice B reason:

Brown fat production. This is incorrect because a newborn under a radiant heat warmer will have less need for brown fat production, not more. Brown fat is a type of fat tissue that generates heat by burning calories. It is found in newborns and helps them maintain their body temperature in cold environments. A warmer environment will reduce the need for brown fat activation. • Choice C reason:

Shivering. This is incorrect because a newborn under a radiant heat warmer will not shiver, but shivering is not the main mechanism of heat production in newborns. Shivering is an involuntary contraction of muscles that generates heat by increasing metabolism. Newborns have limited ability to shiver because of their immature nervous system and low muscle mass. They rely more on brown fat and increased metabolic rate to produce heat. • Choice D reason:

Cold stress. This is correct because a newborn under a radiant heat warmer will prevent cold stress, which is a condition where the newborn's body temperature drops below normal and causes adverse effects. Cold stress can impair oxygen delivery, increase acidosis, decrease blood glucose, and increase the risk of infection and bleeding. A radiant heat warmer provides a neutral thermal environment for the newborn and prevents heat loss by radiation.

: 1 : 2 : 3 : 4.

Choice A reason:

Choice A is incorrect because an Apgar score of 7 would not be appropriate for the described condition. An Apgar score of 7-10 is considered normal for a baby at 1 minute after birth. This baby shows positive signs such as a heart rate of 138 bpm, loud vigorous crying, spontaneous movement and flexion of the extremities, and pink skin color except for a bluish color of the hands and feet, which indicate good overall health.

Choice B reason:

Choice B is the correct answer. An Apgar score of 8 is appropriate for the described condition.

The Apgar score evaluates the baby's condition at 1 minute after birth based on five criteria: heart rate, respiratory effort, muscle tone, reflex irritability, and color. Each criterion is scored from 0 to 2, and the scores are summed up to determine the overall Apgar score. In this case, the baby exhibits positive signs in most of the criteria, resulting in an Apgar score of 8.

Choice C reason:

Choice C is incorrect because an Apgar score of 9 would be too high for the baby's condition. While the baby is exhibiting positive signs, there are still some concerns such as the bluish color of the hands and feet, which may indicate some minor circulation issues.

Choice D reason:

Choice D is also incorrect because an Apgar score of 10 is the highest possible score, and it is typically given to babies who exhibit absolutely no signs of distress or health issues at 1 minute after birth. While this baby shows mostly positive signs, the bluish color of the hands and feet suggests that there might be some minor health concerns, justifying an Apgar score of 8.