Conduction velocity in myelinated fibers is faster than unmyelinated fiber, mainly because ()
A. diameter
B. temperature
C. the thickness of myelin sheath
D. saltatory conduction
E. the intensity of stimulation
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Which of the following hormones is associated with acromegaly? ()
A. growth hormone
B. thyroid hormone
C. thyroid stimulating hormone
D. adrenocorticotropic hormone
E. thyrotropin releasing hormone
Which of the following is true during inspiration? ()
A. Intrapleural pressure is positive
B. The volume in the lungs is less than the functional residual capacity (FRC)
C. Alveolar pressure equals atmospheric pressure
D. Alveolar pressure is higher than atmospheric pressure
E. Intrapleural pressure is more negative than it is during expiration
Which volume remains in the lungs after a maximal expiration? ()
A. Tidal volume (VT)
B. Vital capacity (VC)
C. Expiratory reserve volume (ERV)
D. Residual volume (RV)
E. Functional residual capacity (FRC)
A 49-year-old man has a pulmonary embolism that completely blocks blood flow to his left lung. As a result, which of the following will occur? ()
A. Ventilation/perfusion(V/Q) ratio in the left lung will be zero
B. Systemic arterial PO2 will be elevated
C. V/Q ratio in the left lung will be lower than in the right lung
D. Alveolar PO2 in the left lung will be approximately equal to the PO2 in inspired air
E. Alveolar PO2 in the right lung will be approximately equal to the PO2 in venous blood
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