What is the normal pH of blood?
7.3 to 7.5
7.6 to 7.8
6.8 to 7.0
7.0 to 7.2
The Correct Answer is A
A. 7.3 to 7.5: Correct (closest choice) -normal arterial blood pH is about 7.35–7.45, so 7.3–7.5 best matches the normal range given.
B. 7.6 to 7.8: this is alkalotic and well above normal physiologic range.
C. 6.8 to 7.0: this is severely acidotic and below normal.
D. 7.0 to 7.2: still acidotic and below the normal physiological range.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Endocardium: The endocardium is the inner endothelial lining of the heart chambers (endothelium + connective tissue), not cardiac muscle, so it does not contain intercalated discs.
B. Parietal pericardium: The parietal pericardium is the outer layer of the serous/fibrous sac surrounding the heart (protective membrane), not muscle tissue, so it lacks intercalated discs.
C. Epicardium: The epicardium (visceral layer of serous pericardium) covers the heart surface and contains connective tissue and fat; it overlies the myocardium but is not the muscle layer itself, so it does not have intercalated discs.
D. Myocardium: The myocardium is the heart’s muscular wall composed of cardiac muscle cells that are connected by intercalated discs (for electrical and mechanical coupling).
Correct Answer is {"dropdown-group-1":"A"}
Explanation
Correct answer: Cervical lymph nodes
Cervical lymph nodes are located along the sides of the neck and drain the scalp, face, and structures of the head and neck; the lymph nodes indicated by the arrow in the neck region correspond to the cervical group.
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