Motion will occur in a muscle when the _____ supplied exceeds the _____
a) effort, load
b) resistance, lever
c) load, effort
d) load, resistance
e) lever, effort
a
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The importance of the plateau phase of the action potential of myocardial cells is in
A) enhancing the efficiency of oxygen use by the cells. B) preventing overstretching of the cells. C) regulating Ca2+ availability to the cells. D) preventing fibrillation. E) preventing tetanus.
Which of the following is not a part of the pelvis?
A) sacrum B) coccyx C) coxal bone D) lumbar vertebrae E) both coccyx and lumbar vertebrae
Which of the following is NOT an effect of testosterone on males?
A) stimulation of the posterior pituitary B) deepening of the voice C) growth of facial hair D) sperm production E) development of heavy bones and muscles
Which of the following statements is TRUE with regard to the motor control hierarchy?
A. The highest level of the hierarchy of motor control includes the frontal lobe cortex, the primary motor cortex, muscle sensory receptors, and the basal nuclei. B. The highest level of the hierarchy of motor control is composed entirely of areas of cerebral cortex, and its main purpose is to create a conscious plan to move that depends on the initial position of the parts of the body in space. C. Neurons of the middle level of the hierarchy integrate afferent information with signals from higher center command neurons to create a motor program--a pattern of neural activity required to properly perform a desired movement. D. The local level of the motor control hierarchy includes the premotor and primary motor regions of the cerebral cortex, as well as the alpha motor neurons and muscle fibers themselves. E. Reflexes that include local-level receptors and muscle fibers cannot occur without input from the higher centers of the motor control hierarchy.