Ace the CVS Pharmacy Exam 2025 - Your Prescription for Success!

Question: 1 / 400

In how many weeks does the anatomical closure of the ductus arteriosus typically occur?

1-2 weeks

3-4 weeks

The anatomical closure of the ductus arteriosus typically occurs within 3-4 weeks after birth. After birth, the transition from fetal to neonatal circulation leads to changes in blood flow dynamics and oxygen levels, which induce the contraction of the smooth muscle in the ductus arteriosus. This closure is crucial for the separation of the pulmonary and systemic circulations, allowing for proper oxygenation of the blood in the lungs.

The timing of 3-4 weeks is significant as it marks the period during which the ductus arteriosus forms a fibrous band and gradually moves towards complete closure. This physiological process is essential for the independent functioning of the lungs and the heart postnatally. Understanding this timeline helps in recognizing potential congenital heart conditions if the ductus arteriosus remains patent longer than expected.

Get further explanation with Examzify DeepDiveBeta

6-8 weeks

12 weeks

Next Question

Report this question

Download CVS Practice Test PDF Study Guide
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy