Oxygen-rich blood returns to the left atrium through veins numbering:

Question

Accepted Answer

B. 4

1. Each lung sends more than one vein back to the heart.
2. Together they deliver oxygenated blood to the left atrium.
3. There are 4 pulmonary veins.
_Source: OpenStax Anatomy and Physiology 2e, Chapter 19, The Cardiovascular System: The Heart._

Answer

6

Answer

2

Answer

3

Oxygen-rich blood returns to the left atrium through veins numbering:

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