After birth, which of the following events does not occur?
A) The foramen ovale closes due to blood pressure changes.
B) Resistance to blood flow through the pulmonary circuit decreases.
C) Blood pressure in the left atrium decreases.
D) The umbilical vessels constrict.
E) Blood pressure in the right atrium falls.

Question

Quizplus · Accepted Answer

After birth, the blood pressure in the left atrium actually increases, not decreases. This is because the lungs expand and start oxygenating blood, leading to an increase in blood return to the left atrium from the lungs. This increased pressure helps in closing the foramen ovale, a fetal circulation feature.

After Birth, Which of the Following Events Does Not Occur