Contraction of the diaphragm results in ________.
A. expiration
B. urination
C. a flat stomach ("sucking in your gut")
D. inspiration
Answer: D
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After activation of C3 of the complement system, which of these is a role of its component part, C3b?
A. It acts as an enzyme to convert nitric oxide into hydrogen peroxide. B. It causes vasodilation of local blood vessels. C. It acts as an opsonin that is recognized by phagocytes targeting the microbe for destruction. D. It acts as a chemotaxin for macrophages. E. It stimulates the conversion of monocytes to neutrophils.
When is the thymus most active?
A) during old age B) during middle age C) throughout life D) during infancy and youth E) from puberty to adulthood
Which of the following regional terms refers to the back of the knee?
A. Sural B. Crural C. Cubital D. Perineal E. Popliteal
What is the role of calcium in muscle contraction?
A. It binds to troponin to expose an actin binding site. B. It binds to tropomyosin to expose a binding site for thick myofilaments. C. It stimulates the passage of an electrical signal along the length of the sarcolemma. D. It provides energy for contraction. E. It binds to troponin to expose a myosin binding site.