Smokers are more susceptible to respiratory infections because
A. they congregate in small areas to smoke.
B. the respiratory passages have too little mucus.
C. their respiratory passages lose cilia, which would otherwise remove bacteria.
D. their respiratory passages overproduce cilia, to which bacteria cling.
Answer: C
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Tendon sheaths ________
A) act as friction-reducing structures B) help anchor the tendon to the muscle C) are lined with dense irregular connective tissue D) are extensions of periosteum
Which of the following statements about negative feedback is incorrect?
a. It exists when a change in a regulated variable triggers a response that opposes the change. b. It exists when the input to a system increases the output and the output inhibits the input. c. The control system's input and output continue to enhance each other. d. It is the method by which most of the body's control mechanisms operate. e. It helps maintain the body's dynamic, steady state.
Which of the following is not attributable to components of the complement system?
a. formation of a membrane-attack complex b. walling-off of the inflamed area c. serving as chemotaxins d. acting as opsonins e. enhancing local vascular changes
Excess cortisol could result in:
A) increased parasympathetic nervous system activation. B) an alkaline blood pH. C) low blood pressure. D) high blood glucose levels.