The Venturi mask is MOST useful in the prehospital setting when:
A) a patient requires less than 15% oxygen.
B) high-flow oxygen is required for severe hypoxia.
C) patients cannot tolerate a nonrebreathing mask.
D) a COPD patient requires a long-range transport.
Answer: D) a COPD patient requires a long-range transport.
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Intracellular fluids have high concentrations of
A. sodium and phosphate ions. B. potassium and phosphate ions. C. sodium and chloride ions. D. chloride and potassium ions.
Which muscle can be seen on the lateral thigh?
A) rectus femoris B) adductor muscles C) vastus medialis D) iliotibial muscle
Which of the following normally occurs when a doctor's reflex hammer taps a patient's patellar tendon?
A. Alpha motor neurons stimulate contraction of extrafusal fibers in extensor muscles. B. Alpha motor neurons stimulate contraction of intrafusal fibers in extensor muscles. C. Golgi tendon organs in the patellar tendon stimulate the contraction of extrafusal fibers of extensor muscles. D. Alpha motor neurons that innervate ipsilateral flexor muscles are stimulated. E. Inhibitory interneurons reduce action potential firing in alpha motor neurons to extrafusal fibers of extensor muscles.
Which of these phases of stomach secretion is correctly matched?
A) Cephalic phase: the largest volume of secretion is produced. B) Gastric phase: gastrin secretion is inhibited by distention of the stomach. C) Gastric phase: initiated by chewing, swallowing, or thinking of food. D) Gastrointestinal phase: stomach secretions are inhibited.