Answer:
A. the blood pressure in the heart chamber from which blood is flowing is higher than the blood pressure in the chamber to which the blood is supposed to flow.
Explanation:
A heart valve opens or shuts on both sides with varying blood pressure. As the heart muscle contracts and relaxes, the valves open and shut. This lets blood flow into the ventricles and atria at alternate times.
When the left ventricle relaxes, the aortic valve closes and the mitral valve opens. This lets blood flow from the left atrium into the left ventricle.
Answer:
Egg Cells from the Ovaries Move Through the Uterine Tubes
A constricted section called the isthmus connects with the uterus. Finally, an intermediate, dilated portion, the ampulla, curves over the ovary. Egg fertilization usually occurs in the ampulla. The eggs then travel through the isthmus into the uterus.
Answer: true
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