The nose contains a single septal cartilage. How many alar cartilages are in the nose?
A. One
B. Two
C. Three
D. Four
D
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Which cranial fossa supports the cerebellum?
A. Anterior B. Middle C. Posterior D. Lateral E. Medial
Why are calcium ions necessary for skeletal muscle contraction?
A) Calcium ions increase the speed of the action potential transmitted along the sarcolemma. B) Calcium ions release the inhibition on Z discs. C) Calcium ions trigger the binding of myosin heads to actin filaments. D) Calcium ions cause ATP binding to actin. E) Calcium ions bind to regulatory proteins on the myosin filaments, changing both their shape and their position on the thick filaments.
The enzyme found in tears, saliva, and nasal secretions that acts to destroy bacteria is ________.
A. a lysozyme B. an interferon C. an antibody D. All of these choices are correct.
The agglutinogens that determine the ABO and Rh blood types are
A. found on the surface of erythrocytes. B. part of the reticular connective tissue of the spleen. C. found in the cytoplasm of the erythrocytes. D. located on the surface of the leukocytes. E. located in the cytoplasm of the leukocytes.