When the diaphragm contracts
a. the volume of the thoracic cavity increases.
b. lung volume increases as the lungs are forced to expand.
c. the intra-alveolar pressure increases.
d. both (a) and (b) above.
e. all of these answers.
D
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A) smooth muscle. B) cardiac muscle. C) adipose tissue. D) glands. E) skeletal muscle.
The actual sites of gas exchange within the lungs include
A) bronchioles. B) alveolar ducts. C) pleural spaces. D) alveoli. E) capillary beds.
Support cells of the brain and spinal cord are called ________.
A. glia B. fibroblasts C. mesoderm D. neurons E. acinar
The sodium chloride molecule breaks apart in water. What does "A" represent?
A. chloride ion B. dissociation C. water molecule D. sodium ion E. salt crystal