Which of the listed cranial bones contain the organs of hearing and balance, and articulate with the mandible?
a) Frontal
b) Temporal
c) Parietal
d) Occipital
e) Nasal
b
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Perforating canals
A) are arranged parallel to the long axis of the central canal. B) are always associated with osteons in cancellous bone. C) provide passageways for linking the blood vessels of the central canals with those of the periosteum and the marrow cavity. D) occur in growing juvenile bone, but are obliterated in adult bone. E) are arranged in concentric layers around a central canal.
Which of the following is not true of otoliths?
A. They cause the stereocilia to bend, which is the stimulus for sending nerve impulses to the cerebrum. B. They add weight to the otolithic membrane as the head is tilted, which causes it to sag. C. They are embedded in the gelatinous portion of the otolithic membrane. D. They consist of magnesium chloride. E. All of these are true of otoliths.
The calcium ions involved in skeletal muscle contraction bind to a(n)________ subunit.
A. actin B. myosin C. elastin D. tropomyosin E. troponin
When does hyperpolarization occur?
A) immediately following threshold B) just prior to depolarization C) at the same time as a membrane repolarizes D) immediately following the action potential