A pivot joint
A. is a modified ball and socket joint.
B. restricts movement to rotation.
C. is a biaxial joint.
D. allows gliding movement.
E. is between the atlas and the occipital bone.
B
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Cardiac reserve is
A. the potential increase in stroke volume someone would show if they engaged in athletic training. B. the increase in cardiac output an individual is capable of demonstrating during vigorous exercise. C. the amount of blood left in the heart after the ventricle has contracted during cardiac cycles at rest. D. the blood that the heart uses to nourish its cardiac muscle and does not put into general circulation.
Which statement is not accurate about the absolute refractory period?
a. Another stimulus, regardless of its strength, cannot initiate another action potential during this period b. During this period, voltage-gated Na+ channels open, then close but are inactivated c. Immediately following this period, the membrane can experience another action potential if the stimulus is strong enough d. This period occurs during the after hyperpolarization phase of the action potential e. This period ensures a unidirectional spread of the action potential down a nerve fiber
Which of the following statements concerning smooth muscle is true?
A. The cells are large and multinuclear. B. Caveolae seem to take the place of the myofibrils. C. It contains many sarcomeres. D. A calcium-calmodulin complex initiates cross-bridge formation. E. It has a well-developed sarcoplasmic reticulum.
Which of the following bones forms most of the roof of the cranium?
A. Temporal B. Mandible C. Parietal D. Frontal