Which portion of the conductive system is considered to be the pacemaker of the heart?

a. arteriovalvular node c. sinoarterial node
b. sinoatrial node d. atrioventricular node


b. sinoatrial node

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Each lobule of the testes is filled with ____, which are filled with the spermatogenic cells that give rise to sperm cells. 

A. spermatogonia B. spermatocytes C. seminiferous tubules D. bulbourethral glands E. spermatids

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Where is the balloon dilator inserted percutaneously in coronary artery angioplasty?

a. radial artery b. carotid artery c. femoral artery d. subclavian artery

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 Number 3 in the figure is the ________ muscle.

Fill in the blank(s) with the appropriate word(s).

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Septic pulmonary embolism (unspecified infective organism) __________

Fill in the blank(s) with the appropriate word(s).

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