Which of the following structures is considered to be the pacemaker of the heart?

a. atrioventricular node
b. sinoatrial node
c. atrioventricular bundle
d. Purkinje fibers
e. intercalated discs


b

Biology & Microbiology

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You are examining an animal in lab which you do not recognize immediately, but dissection shows that it has a backbone and a two-chambered heart, so you classify it among the

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Which of the following lack a nucleus and are

structurally simple? a. eukaryotes b. prokaryotes c. fungi d. algae e. all of these

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The majority of naturally occurring amino acids are

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What process releases urine from the bladder?

A) filtration B) excretion C) micturition D) nephronation

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