Which of the following factors keeps the alveoli expanded?
A. Negative intra-alveolar pressure
B. Alveolar pressure being equal to atmospheric pressure
C. A reduction in surfactant
D. A pneumothorax
E. Negative pleural pressure
Answer: E
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Underneath the endothelium of arteries is a layer of
A) collagen fibers. B) adipose tissue. C) elastic fibers. D) smooth muscles. E) None of the answers are correct.
Gastric secretion does not begin until the arrival of food in the stomach
Indicate whether the statement is true or false
In children, when sex hormones are produced prematurely, the obvious behavioral changes will cause the child to be __________.
a. aggressive and assertive b. regressive and retarded c. lethargic and docile d. overweight and disgruntled
If you enter a dimly lit room, will you be able to see clearly? Why or why not?
What will be an ideal response?