A heartbeat begins in the:
A) Atrioventricular valve
B) Atrioventricular node
C) Sinoatrial node
D) Right ventricle
E) Left atrium
Correct Answer:
Verified
Q10: The tough connective tissue sac surrounding the
Q11: Vertebrates with a four-chambered heart include:
A)Fish
B)Reptiles
C)Birds
D)Amphibians
E)Annelids
Q12: A heart murmur is caused by:
A)A greater
Q13: The myocardium is the:
A)Sac surrounding the heart
B)The
Q14: Vertebrates with a three-chambered heart include:
A)Fish
B)Amphibians
C)Birds
D)Mammals
E)Annelids
Q16: The semilunar valves:
A)Prevent arterial blood from reentering
Q17: The chamber of the heart that is
Q18: The upper chambers of the mammalian heart
Q19: Cardiac output may increase by:
A)A greater than
Q20: The large vessels that carry blood to
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