________ diffusion is a process in which carrier proteins ferry substances down their concentration gradient without the use of cellular energy.
Fill in the blank(s) with the appropriate word(s).
Facilitated
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A male sustains a crushing injury to his foot. After weeks of care, he begins to notice that he cannot bend the little toe on his right foot. Which of the following would be a logical diagnosis?
A. Atrophy of the flexor hallucis brevis B. Atrophy of the fibularis brevis C. Atrophy of the soleus D. Atrophy of the flexor digiti minimi E. Atrophy of the adductor hallucis
A twofold increase in the blood flow through a pulmonary arteriole is associated with:
A. no significant change in pulmonary vascular resistance B. a twofold increase in pulmonary vascular resistance C. a fourfold increase in pulmonary vascular resistance D. a fifteenfold increase in pulmonary vascular resistance
Breathing, which involves the physical movement of air into and out of the lungs, is __________.
a. pulmonary ventilation b. alveolar ventilation c. internal respiration d. gas diffusion
Activation of a ________ leads to the perception of pain and itch.
Fill in the blank(s) with the appropriate word(s).