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Similar to veins, lymphatic vessels contain valves to prevent the backflow of lymph due to gravity.

Why can’t someone with Type A negative blood receive packed cells from a B positive donor?

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The main reason why an individual with type AB negative blood CANNOT donate packed cells to an individual with type A positive blood is because 

Juxtamedullary nephrons allow for less water absorption than cortical nephrons because of their long Loops of Henle.

Because Ann’s kidneys are failing to respond to parathyroid hormone in a way that helps recover calcium ions from filtrate. What renal structure is likely abnormal?

If the blood is acidic the body will re-balance the pH by

A person with elevated numbers of eosinophil is most likely suffering from ——————-.

Menstruation begins on day ___ of the uterine cycle primarily due to the decline of __________.

Which of the following is part of the lower respiratory system?