The pacemaker of the mammalian heart is:
A) an electrically charged region of the pulmonary vein.
B) a group of specialized cardiac muscle cells that initiate the heartbeat.
C) modulated by signals from the autonomic nervous system.
D) a group of fibers located between the atrium and the ventricle called the AV node.
Correct Answer:
Verified
Q120: Which of the following statements is FALSE?
A)The
Q121: In which of the following animals does
Q122: Mammals and birds have four-chambered hearts and
Q123: What is the advantage for birds and
Q124: Which of the following statements is FALSE?
A)There
Q126: Which of the following animals has a
Q127: The initiation of the mammalian heart contraction:
A)takes
Q128: What would happen to a mammalian heart
Q129: Which of the following statements is FALSE?
A)Oxygenated
Q130: Stimulation by the parasympathetic nervous system increases
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