B lymphocytes are directly responsible for cell-mediated immunity.
Answer the following statement true (T) or false (F)
False
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The tough structure that surrounds the heart and helps reinforce and maintain position of the heart is the
A) mediastinum. B) epicardium. C) pericardial sac. D) pleural cavity. E) aorta.
Glycogen in an adult's liver and muscles provides enough reserve energy to meet energy
demands for about 12 hours. Indicate whether the statement is true or false
Which of the following does NOT occur as a sarcomere shortens during muscle contraction?
A. The H zone shortens. B. The I bands shorten. C. The Z lines (discs) move closer together. D. The thin and thick myofilaments shorten in length. E. All of these occur as a sarcomere shortens.
Which of the following statements concerning the inner ear is true?
A. The footplate of the incus fits into the round window. B. The spiral organ is found in the semicircular canals. C. The cochlear duct is filled with perilymph. D. The vestibule is one of the regions of the organ of corti. E. The bony core of the cochlea is called the modiolus.