During expiration:
a. the diaphragm relaxes and moves up into the thoracic cavity
b. the chest cavity is reduced in volume
c. the pressure in the thoracic cavity increases
d. all of the above
d. all of the above
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Which serous membrane covers the external surface of an organ?
A. The parietal layer B. The muscle layer C. The visceral layer D. The ventral layer E. The dorsal layer
Autonomic tone is an important aspect of ANS function because it
A) allows ANS neurons to be silent under normal conditions. B) allows ANS neurons to increase activity on demand but not decrease their activity. C) allows ANS neurons to decrease their activity on demand but not increase their activity. D) allows ANS neurons to increase or decrease their activity, providing a range of control options. E) provides for a narrow range of control options that keeps target tissues constantly active.
Answer the following statements true (T) or false (F)
1) A fibrin clot that forms at the surface of a wound to the skin is called granulation tissue. 2) A thickened area of scar tissue covered by a smooth epidermal surface is called a keloid. 3) The perforating canals run perpendicular to osteons. 4) The central canal runs parallel to osteons. 5) Every bone contains relatively large a medullary cavity.
When air passes through the glottis, which structures vibrate to produce sound?
A. thyroid folds B. ventricular folds C. epiglottal cords D. cricohyoid folds E. vocal folds (cords)