Question

1. in the circulatory system, where does oxygen - rich blood flow after entering the lungs?

a. to the trachea to be released into the atmosphere
b. to the heart, where it will be pumped through arteries and delivered to cells
c. to the brain, which will determine how much oxygen is in the blood

Explanation:

Oxygen - rich blood in the lungs enters the pulmonary veins and then flows to the left atrium of the heart. From the heart, it is pumped through arteries to be delivered to cells throughout the body. Option a is incorrect as blood doesn't go to the trachea to be released. Option c is incorrect as the brain doesn't determine the amount of oxygen in the blood in this context.

Answer:

B. To the heart, where it will be pumped through arteries and delivered to cells