What structural component of cardiac muscle cells allows for electrical current to flow from cell to cell?
A. Tight junctions
B. Adhesion junction
C. Gap junctions
Answer: C
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When the heart is sympathetically stimulated,
a. ESV will likely decrease b. it is responding to acetylcholine c. the fibrous skeleton of the heart is depolarizing d. its stroke volume will decrease e. all except c will occur
Which tissue is characterized by an abundance of intercellular material called the matrix?
a. epithelial b. nervous c. muscle d. connective
Of the two functional areas of the blastocyst, which one gives rise to the three primary germ layers?
A) amnion B) morula C) inner cell mass D) trophoblast
Alveolar ventilation
a. is the amount of air entering the body with each breath b. is the tidal volume minus the anatomic dead space volume c. is the same as tidal volume d. increases when you take many shallow breaths