The normal pacemaker of the heart is the
a. SA node
b. AV node
c. bundle of His
d. Purkinje system
e. ventricular myocardium
A
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Which of the following statements is true? Select one:
a. As thoracic volume increases, alveolar pressure (Palv) increases.
b. In expiration, the thoracic volume increases.
c. Constriction of bronchioles assists breathing.
d. As alveolar volume increases, alveolar pressure (Palv) decreases.
e. Pressure is directly proportional to volume.
Without surfactant, _______.
A. the surface tension of the liquid in the alveoli would be less and the alveoli would collapse B. the alveoli would collapse C. the surface tension of the liquid in the alveoli would be greater D. the surface tension of the liquid in the alveoli would be greater and the alveoli would collapse E. the surface tension of the liquid in the alveoli would be less
The medical term for a double row of eyelashes is:
A) buphthalmos B) distichia C) uveitis D) amblyopia
In the diagram shown below, which cellular junction is a tight junction?
a) A b) B c) C d) D e) E