Linea nigra is commonly found on the abdomens of:
older adults
infants and children
adolescents
pregnant women
The Correct Answer is D
A. Linea nigra is not typically found in older adults.
B. Infants and children do not generally exhibit linea nigra.
C. Adolescents do not commonly have linea nigra.
D. Linea nigra is a dark line that appears on the abdomen of pregnant women due to hormonal changes and increased pigmentation.
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Correct Answer is B
Explanation
A. Early ventricular repolarization is represented by the T wave, not the P wave.
B. The P wave represents atrial depolarization, which is the electrical activity that triggers the contraction of the atria.
C. Slow repolarization of ventricular Purkinje fibers is represented by the T wave, not the P wave.
D. Ventricular depolarization is represented by the QRS complex, not the P wave.
Correct Answer is A
Explanation
A. Ventricular tachycardia: Ventricular tachycardia (VT) is identified by a regular, fast rhythm with wide QRS complexes, typically without visible P waves. This rhythm often appears as consecutive, large, uniform waves, which is consistent with what is seen in the diagram.
B. Asystole: Asystole is characterized by a flat line, indicating no electrical activity, which is not present in this strip.
C. Normal sinus rhythm: Normal sinus rhythm would show identifiable P waves, a normal QRS complex, and a regular rate, which are not observed here.
D. Ventricular fibrillation: Ventricular fibrillation appears as chaotic, irregular waveforms with no clear QRS complexes or organization, which does not match the rhythm shown.