Question 84

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  • #29486
    Sharanya
    Participant

    The answer explanation and answer key do not match. Which is correct?

    #29487
    Max Kinne
    Moderator

    Hi Sharanya,

    Are you referring to the lecture question #84 or the in-class exam #84?

    Max

    #29488
    Sharanya
    Participant

    Hi Max,

    I am referring to lecture question number 84.

    Sharanya

    #29489
    Max Kinne
    Moderator

    Hi Sharanya,

    The correct answer is A (which is the answer provided in Answers and Explanations on page 283). Note, the question is asking for the incorrect answer choice (all of the following EXCEPT).

    Normally, the ductus arteriosus, a blood vessel connecting the aorta and the pulmonary artery, closes at birth. In patent ductus arteriosus, this vessel does not close. As a result, oxygenated blood from the aorta (that is normally pumped to tissues) passes back through this vessel into the pulmonary artery. The pulmonary artery normally carries deoxygenated blood to the lungs. In patent ductus arteriosus, the pulmonary artery will also carry oxygenated blood from the aorta. Thus, blood flow to the lungs (pulmonary circulation) will have more oxygen that normal. The blood that reaches the tissues (systemic circulation) will have less oxygen than normal (the opposite of answer choice A) due to this shunting of blood from the aorta to the pulmonary artery.

    Does this clarification help?

    Max

    • This reply was modified 6 months ago by Max Kinne. Reason: Clarification of pulmonary vs. systemic circulation
    #29490
    Sharanya
    Participant

    Hi Max,

    Yes thank you!

    Sharanya

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