Which of the following determines lung compliance?
A) airway opening
B) flexibility of the thoracic cage
C) muscles of inspiration
D) alveolar surface tension
D) alveolar surface tension
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A solution with a pH value less than 7 is
a) basic. b) neutral. c) acidic. d) alkaline. e) concentrated.
The following are steps in the cell-mediated immune response. What is the correct sequence for these steps? 1. Several cycles of mitosis occur. 2. Antigen is engulfed and presented by a macrophage. 3. Cytotoxic T cells migrate to focus of infection. 4. T cells with specific receptors recognize the antigen. 5. T cells differentiate into cytotoxic T cells or T memory cells. 6. Cytotoxic T cells
release perforin and/or lymphotoxin. A) 4, 1, 5, 3, 6, 2 B) 2, 4, 1, 5, 3, 6 C) 1, 2, 4, 5, 3, 6 D) 3, 2, 4, 1, 5, 6 E) 3, 6, 4, 5, 1, 2
When resistance is high, a larger blood pressure gradient must be produced to maintain adequate blood flow.
Answer the following statement true (T) or false (F)
Each of the following factors will increase cardiac output except
A) increased venous return. B) increased parasympathetic stimulation. C) increased sympathetic stimulation. D) increased heart rate. E) increased venous return and increased parasympathetic stimulation.