What primarily determines airway resistance in the respiratory passageways?
A) degree of alveolar surface tension B) elasticity of the lung tissues
C) diameter of the conducting zone passageways D) presence of surfactant
Answer: C
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Surfactant is necessary to prevent collapse of the alveoli in the lung because in its absence water molecules
A. vaporize and take up much less space.?B. are more strongly attracted to each other by van der Waals forces.?C. are more strongly attracted to each other by cohesive forces.?D. congregate around nearby proteins to which they adhere.
The distal end of each uterine tube in the female reproductive system is a funnel-shaped opening called the ________________________________________
Fill in the blank(s) with correct word
Direct stimulation of neurons within the dorsal respiratory group would cause an increase in the frequency of action potential in the
A. intercostal nerves to internal intercostals muscles. B. glossopharyngeal nerve that innervates the pharyngeal muscles. C. intercostal nerves to external intercostals muscles. D. phrenic nerve that innervates the diaphragm. E. vagus nerve that innervates the smooth muscle of the bronchioles.
which term refers to the loose connective tissue layer that surrounds skeletal muscle fascicles?
a) fascia b) perimysium c) endomysium d) epimysium