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.
B) Tina suffered no damage to her spinal cord.
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Prolonged vomiting of the stomach's contents can result in
A) respiratory acidosis. B) metabolic alkalosis. C) respiratory alkalosis. D) metabolic acidosis. E) None of the answers are correct.
Stacy has been tired and bruising easily, and she's had three respiratory infections in the
past few months. She has also had headaches and a few nosebleeds. A physician should check her for A) leukemia. B) erythroblastosis fetalis. C) edema. D) sickle cell disease.
The T tubules
a. store Ca2+ b. provide a means of rapidly transmitting ACh to the central portions of the muscle fiber c. provide attachment sites for ACh d. perform b and c e. do not do any of the above
Stretch reflexes:
A. occur only in the legs. B. inhibit antagonistic muscles. C. mediate flexor activation and withdrawal from a painful stimulus. D. are initiated by stimulation of Golgi tendon organs. E. are initiated by stretching of extrafusal muscle fibers.