What does the QRS complex represent in the ECG wave tracing?
What will be an ideal response?
ventricular depolarization
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Ten-year-old Tina falls while climbing a tree and lands on her back. Her frightened parents take her to the local emergency room where she is examined. Her knee jerk reflex is normal and she exhibits a negative Babinski reflex. These results suggest that
A) Tina has injured one of her descending nerve tracts. B) Tina suffered no damage to her spinal cord. C) Tina has a spinal injury in the lumbar region. D) Tina has injured one of her ascending nerve tracts. E) Tina has a spinal injury in the cervical region.
The endoderm forms
A) muscle. B) blood. C) neural tissue. D) skin. E) the urinary bladder.
The element necessary in the diet for proper thyroid function is ________.
A) sodium B) potassium C) calcium D) iodine E) bromine
An experimental subject is isolated in an underground room with no windows, no clocks, and no contact with the outside world. Researchers monitoring his behavior observe that he eats breakfast a little bit later each day
What term best describes the subject's biological activity? A. circadian rhythm B. free-running rhythm C. jet lag D. phase shift E. entrainment