Which sequence correctly lists the changes that allow the thick and thin filaments to slide past one another in skeletal muscle contraction?
A. Attach - pivot - detach - return
B. Pivot - attach - detach - return
C. Pivot - attach - return - detach
D. Return - pivot - attach - detach
E. Attach - detach - pivot - return
Answer: A
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Wallerian degeneration involves the breakdown of
A. the segments of axon and myelin sheath between the site of damage and the peripheral effector. B. the segments of axon and myelin sheath between the site of damage and the cell body. C. the neurilemma both central and peripheral to the site of trauma. D. macrophages and microglia that have completed the job of CNS cleanup after trauma.
Label B represents the
A) pulmonary trunk. B) ascending aorta. C) right pulmonary arteries. D) right pulmonary veins. E) superior vena cava.
What is true about the blood supply to the skin?
A) Both epidermis and dermis are poorly vascularized. B) Epidermis is avascular and dermis is richly vascularized. C) Epidermis is richly vascularized and dermis is avascular. D) Both epidermis and dermis are richly vascularized.
Which of the following is not a property of an IgG heavy chain?
A) has one constant segment B) has one variable segment C) binds one light chain D) binds antigen at both ends E) binds complement in the constant region