The nurse tells the expectant mothers during their last prenatal class that their fetus might receive a larger dose of a drug in the later period of their pregnancy. Which processes in the mother's body systems are responsible for this action?
1. Blood flow to placenta increases, and placental vascular membranes become thicker.
2. Blood flow to placenta decreases, and placental vascular membranes become thicker.
3. Blood flow to placenta increases, and placental vascular membranes become thinner.
4. Blood flow to placenta decreases, and placental vascular membranes become thinner.
Correct Answer: 3
Rationale 1: The placenta vascular membranes become thinner.
Rationale 2: The blood flow to the placenta increases and the placenta vascular membranes become thinner.
Rationale 3: Blood flow to placenta increases, and placental vascular membranes become thinner, allowing for more substances to be transferred through the placenta.
Rationale 4: The blood flow to the placenta increases.
Global Rationale: Blood flow to placenta increases, and placental vascular membranes become thinner, allowing for more substances to be transferred through the placenta. The placenta vascular membranes become thinner, not thicker. The blood flow to the placenta increases and the placenta vascular membranes become thinner, not thicker. The blood flow to the placenta increases, not decreases.
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