The influence of blood vessel diameter on peripheral resistance is ________.
A) the only factor that influences resistance
B) significant because resistance is inversely proportional to the fourth power of the vessel radius
C) significant because resistance is directly proportional to the blood vessel diameter
D) insignificant because vessel diameter does not vary
B) significant because resistance is inversely proportional to the fourth power of the vessel radius
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Which of the following is not accomplished by the cerebral cortex?
a. voluntary initiation of movement b. involuntary control of breathing, circulation, and digestion c. final sensory perception d. language ability e. personality traits
Which of these problems in the trachea are associated with cigarette smoking?
A. Ciliated epithelium is replaced by squamous epithelium. B. Mucus and debris accumulate in the trachea. C. Respiratory infections are likely because of accumulated mucus. D. Irritation and inflammation stimulate the cough reflex. E. All of these events occur in smokers.
This figure illustrates epiphyseal plate morphology. Which zones are considered to be bone tissue?
A. 4, 5 B. 1, 2, 3 C. 5 D. 1 E. 3, 4, 5
Vesicular breathing sounds probably result from ________
A) air filling the alveolar sacs B) air rushing through the large respiratory passageways C) air moving through the bronchioles