Which action leads to the closure of the right atrioventricular valve?
A. Contraction of the right ventricle
B. Relaxation of the right ventricle
C. Relaxation of the left atrium
D. Contraction of the right atrium
E. Contraction of the left atrium
Answer: A
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One function of integral membrane proteins in the plasma membrane of cells is to form channels to allow passage of nonpolar solutes into the cell.
Answer the following statement true (T) or false (F)
If the seminal glands of the male reproductive tract ceased to function, how would the male reproductive tract be affected?
A) Maturation of the spermatozoa would not occur. B) The volume of the semen would be greatly reduced. C) There would be no spermatozoa in the ejaculate. D) The spermatozoa in the ejaculate would no longer be able to survive. E) None of the answers are correct.
What type of biaxial joint is characterized by articulating bones with a deeper complementary fit, one with a convex surface and the other with a concave surface?
A) ball-and-socket joint B) saddle joint C) pivot joint D) hinge joint
Which statement is true?
A) The sternum is lateral to the ribs. B) The costal cartilage is posterior to the vertebrae. C) The xiphoid process is superior to the manubrium. D) The false ribs are inferior to the true ribs.