The rising phase of the action potential in the pacemaker cells occurs in response to:
A. activation of long-lasting, voltage-gated Ca2+ channels
B. activation of voltage-gated Na+ channels
C. activation of voltage-gated Cl channels
D. activation of transient Ca2+ channels
E. activation of voltage-gated K+ channels
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In what phase of the heart contraction is the volume of blood in ventricles the GREATEST?
A. right after atrial contraction
B. right before atrial contractio
C. in the middle of ventricular ejection
D. in the middle of ventricular filling
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