What is the importance of the delay in the action potential in the AV node?
A. It allows the action potential to reach both ventricles at the same time.
B. It allows an action potential to reach the left atrium so both atria contract together.
C. It allows an action potential to reach the left atrium so both atria contract together, before the ventricles contract.
D. It allows time for the atria to be filled with blood.
C
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The eye begins to develop during the fourth week of embryonic development.
Answer the following statement true (T) or false (F)
Where is the distal convoluted tubule?
a) D b) E c) J d) K e) L
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.
Which statement comparing action potential and local potential is false?
A. Action potentials are not graded and local potentials are. B. Action potentials are not reversible and local potentials are. C. Action potentials are graded and local potentials are not. D. Action potentials are not decrimental and local potentials are.