Explain alpha-gamma coactivation.
What will be an ideal response?
Alpha motor neurons control the contraction of skeletal muscle fibers. Gamma motor neurons adjust the stretch sensitivity of the muscle spindle, so that the spindle is active even when the muscle shortens. Coactivation of both sets of fibers causes the tension on the muscle spindles to be maintained as the muscle shortens; thus sensitivity to stretch is maintained.
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A. segmental bronchi B. laryngeal cartilages C. lobes D. tracheal cartilages E. choanae
Lymphatic vessels that enter the lymph node at various sites are called ____ lymphatic vessels
a. efferent b. hilial c. trabecular d. afferent
The ethmoid bone contributes to what part of the bony orbit?
A. Lateral wall B. Medial wall C. Floor D. Roof E. Apex
Which of the following may explain why self-tolerance may fail?
A. A noncirculating antigen becomes exposed to the immune system. B. Antibodies produced against foreign antigens cross-react with self-antigens. C. Antibodies directed against other antibodies are produced. D. All of the choices are correct.