As ATP binds to the myosin head at the beginning of a muscle contraction cycle, the myosin head immediately
A) initiates binding with actin.
B) swivels.
C) tightens its bond to actin.
D) detaches from actin.
D) detaches from actin.
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Which of the following is the connection point between the axial skeleton and appendicular skeleton?
A) pelvis - femur B) vertebra - sacrum C) vertebra - scapula D) sternum - clavicle E) vertebra - skull
Just prior to atrial contraction,
A. both ventricles are contracting and blood is being ejected into the major arteries. B. all four chambers are at rest and AV valves are open. C. all four chambers are at rest and AV valves are closed. D. both atria are contracting and blood is being ejected into the major arteries. E. all four chambers are contracting and all valves are open.
Which of the following statements is/are true?
A. The hip is more stable than the shoulder. B. The shoulder has more range of motion than the hip. C. both A and B D. none of the above
Which of the following is not a muscle in the posterior thoracic region?
A. trapezius B. levator scapulae C. rhomboid minor and major D. serratus posterior superior and inferior E. All of the above are muscles in the posterior thoracic region.