Q- Which one of the following parts of lymph nodes has T lymphocyte as the predominate cell?
A-Cortex
B- Germinal center
C- Medulla
D- Paracortex
D- Paracortex- The cortex is composed of primary and secondary follicles, the germinal center contains B lymphocytes and the medulla contains plasma cells and small lymphocytes.
Q- Which of the following layers of the heart forms the cardiac valves and continues with the intima of the aorta?
A- Endocardium
B- Epicardium
C- Myocardium
D- Pericardium
A- Endocardium- The endocardium lines the lumen of the heart, forms the valves and continues as the intima of the great vessels entering and leaving the heart.
Q- Which of the following types of cells predominantly lines the conducting airways of the lung and is considered an important defense mechanism?
A- Basal cells
B- Ciliated cells
C- Endocrine cells
D- Goblet cells
B- Ciliated cells- All these cells are present in the conducting airways but the ciliated cell is the primary defense mechanism against bacteria and other foreign bodies.
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