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
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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
A. amphibians. B. reptiles. C. birds. D. fish. E. mammals.
Which of the following lack a nucleus and are
structurally simple? a. eukaryotes b. prokaryotes c. fungi d. algae e. all of these
The majority of naturally occurring amino acids are
A) acidic and polar. B) basic and nonpolar. C) acidic and nonpolar. D) neutral and nonpolar. E) neutral and polar.
What process releases urine from the bladder?
A) filtration B) excretion C) micturition D) nephronation