Which of the choices below describes the forces that act to pull the lungs away from the thorax wall and thus collapse the lungs?
A) compliance and transpulmonary pressures
B) compliance and the surface tension of the alveolar fluid
C) the natural tendency for the lungs to recoil and the surface tension of the alveolar fluid
D) the natural tendency for the lungs to recoil and transpulmonary pressures
C
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When swallowing, the epiglottis covers the larynx
Indicate whether the statement is true or false
Rugae, plicae, and villi are all features that accomplish
A) secretion of hormones. B) immune function. C) an increase in surface area. D) mechanical digestion. E) secretion of enzymes.
Answer the following questions true (T) or false (F)
1. During the absolute refractory period, production of an additional action potential is not possible no matter how strong the stimulus. 2. Saltatory conduction is slow due to the presence of insulating myelin around an axon. 3. Conduction speed of a nerve impulse is influenced by the diameter of the axon and the presence or absence of a myelin sheath.
Contraction of the serratus posterior inferior contributes to forced expiration
Indicate whether this statement is true or false.