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Home Q & A Board Biology-Related Homework Help General Biology
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Eye_opener Eye_opener
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6 years ago
The human heart ____.
  a. contracts as a result of electrical stimuli from the sinoatrial node
  b. contracts only as a result of nerve stimulation from the central nervous system
  c. is activated primarily through the autonomic nervous system
  d. contracts as a result of electrical stimuli from the atrioventricular node
  e. is independent of all nervous control

Question 2

The anatomical structure identified with the letter R in the figure above is the ____.
  a. pericardium
  b. cardiac muscle
  c. inferior vena cava
  d. right atrium
  e. heart apex
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tomg2113tomg2113
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6 years ago
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Eye_opener Author
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6 years ago
TY
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6 years ago
My pleasure
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