The circular muscle of the iris
a. contracts in response to bright light to produce pupillary constriction.
b. is innervated by the parasympathetic nervous system.
c. contracts to slacken the suspensory ligaments and increase the strength of the lens during accommodation.
d. both (a) and (b) above.
e. all of these answers.
D
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The ureter extends downward
A) behind the parietal peritoneum and joins the urinary bladder from above. B) in front of the parietal peritoneum and joins the urinary bladder from above. C) behind the parietal peritoneum and joins the urinary bladder from below. D) in front of the parietal peritoneum and joins the urinary bladder from below.
Calcitonin
a. enhances the effect of parathyroid hormone on bone and kidneys. b. is synthesized in the skin in the presence of sunlight. c. deficiency produces diabetes insipidus. d. is secreted by the thyroid follicular cells. e. none of these answers.
Which are characteristics of the cytoskeleton?
A. made up of filaments and microtubules and maintains the cell's shape B. It stores calcium. C. It maintains cell shape. D. It produces proteins.
The QRS complex of an ECG is produced by the ________.
A. depolarization of the atria B. repolarization of the atria C. depolarization of the ventricles D. repolarization of the ventricles