What term refers to a mass of cells that act as a unit?
Intercalated discs
Chordae tendineae
Functional syncytium
Systole
The Correct Answer is C
A. Intercalated discs: Structures that connect cardiac cells and permit coordination, but not the term for the group behavior.
B. Chordae tendineae: Tendinous cords of AV valves; unrelated to cell-unit behavior.
C. Functional syncytium: Describes cells acting together as one unit due to electrical coupling.
D. Systole: The contraction phase of the cardiac cycle, not a term for a cell collective.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. QRS complex: The QRS represents the rapid depolarization of the right and left ventricles (electrical activity that triggers ventricular contraction).
B. T wave: The T wave represents ventricular repolarization (the ventricles recovering electrically), not depolarization.
C. P wave: The P wave represents atrial depolarization, the electrical activation of the atria.
D. PQ segment: The PQ (PR) segment is the brief isoelectric period while the impulse travels through the AV node/AV bundle (a conduction delay), not ventricular depolarization.
Correct Answer is C
Explanation
A. Pepsin or trypsin and peptidases: these are protein digesting enzymes, not primary fat digesters.
B. Amylase and disaccharidases: these digest carbohydrates, not fats.
C. Lipase: lipase (plus bile for emulsification) is required to chemically digest fats into fatty acids and glycerol.
D. Amylase and pepsin: amylase digests starch and pepsin digests proteins; neither is the principal fat-digesting enzyme.
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