Through which structure does blood pass from the right atrium to the right ventricle?
a) Bicuspid valve
b) Interventricular septum
c) Tricuspid valve
d) Mitral valve
e) Ascending aorta
c
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Powerful contractions that occur a few times each day in the colon are called
A) mass movements. B) segmentation. C) phasic contractions. D) peristalsis. E) tonic contractions.
Which of the following muscles of facial expression is not innervated by the facial nerve?
A. Zygomaticus major B. Corrugator supercilii C. Buccinator D. Levator palpebrae superioris E. Orbicularis oculi
Second messengers generated by the actions of phospholipase C ________.
A. are inhibited by the actions of caffeine B. are stimulated by phosphodiesterases C. stimulate gene transcription D. may activate calmodulin
Electrons are shared equally in this type of bond:
-hydrogen -ionic -polar covalent -nonpolar covalent.