Which of the following is a type of booby trap?
A. Broken bottles
B. Electrified windows
C. Weapons tied to doors
D. On/off switches that have been removed
C
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Which of the following statements is true regarding cross-bridges?
a. A cross-bridge is the basic unit of active muscle tension. b. A cross-bridge is formed when head groups on the actin myofilament bind with tropomyosin on the myosin filament. c. Cross-bridges do not occur in lengthening contractions. d. A release of sodium is necessary to reveal the binding site on the actin.
How does CPAP improve oxygenation and ventilation in patients with certain respiratory problems?
A. It forces the alveoli open and pushes more oxygen across the alveolar membrane. B. It pushes thick, infected pulmonary secretions into isolated areas of the lung tissue. C. It decreases intrathoracic pressure, which allows more room for the lungs to expand. D. It prevents alveolar collapse by pushing air into the lungs during the inhalation phase.