The aortic valve closes when __________.
Fill in the blank(s) with the appropriate word(s).
the pressure in the left ventricle falls below aortic pressure
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The medulla oblongata, pons, and midbrain comprise the
A) basal ganglia. B) brain stem. C) mesencephalon. D) ventricles. E) diencephalon.
During a primary humoral response to antigens all of the following occur except
A) B cells may differentiate into plasma cells immediately. B) B cells may undergo several rounds of mitosis before producing plasma cells and memory cells. C) antibody levels do not peak until 1 to 2 weeks after the initial exposure. D) neutrophils invade the surrounding areas, releasing chemotactic substances. E) the first immunoglobulins to appear in circulation are of the IgM type.
At the knee, the femoral artery becomes the ________ artery
A) iliac B) deep femoral C) popliteal D) tibial E) peroneal
Which of the following is not found in the filtrate at the beginning of the proximal tubules
a. water b. glucose c. urea d. salts e. all of the above are found