Which portion of the brain adjusts skeletal muscle activity to maintain equilibrium and posture?
A. Cerebellum
B. Medulla oblongata
C. Pons
D. Cerebrum
E. Epithalamus
Answer: A
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Which of the following become connected by myosin cross-bridges during muscle contraction?
A) thin filaments and thick filaments B) thick filaments and titin filaments C) z disks and actin filaments D) thick filaments and t-tubules E) thin filaments and t-tubules
In regards to hair cells involved in vertebrate hearing organs, we know that
A) Stereocilia are connected to each other by small fibers. B) Mechanosensitive ion channels at the tips of stereocilia are all closed at rest. C) The 9 + 2 arrangement of stereocilia allow for free bending to improve sound resolution. D) Their bending always causes an increase in firing in the primary afferent.
Fear can result in
A) increased stimulation of the cardioinhibitory center by higher brain centers. B) increased stimulation of the cardioacceleratory center by higher brain centers. C) decreased heart rate. D) decreased blood pressure. E) parasympathetic stimulation.
A swollen and painful abdomen is a sign of
a. bloat c. overeating b. constipation d. dehydration