When blood flow to an area of the lungs is reduced but the area receives normal air flow all of the following occur except
a. the concentration of CO2 in this area will be decreased.
b. the change in CO2 concentration will cause the smooth muscles of the local airways to relax.
c. the change in CO2 concentration will lead to increased resistance of local airways.
d. the change in O2 concentration will lead to dilation of local blood vessels.
e. the change in O2 concentration will lead to decreased vascular resistance.
B
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The term for the ridge where the trachea bifurcates into the right and left primary bronchi is the ____________________.
Fill in the blank(s) with the appropriate word(s).
Ligaments that support the hyoid bone are attached to the
A) styloid process. B) mastoid process. C) palatine process. D) coronoid process. E) zygomatic process.
The filtration membrane consists of the
A. podocytes, basement membrane, and macula densa. B. capillary epithelium, podocytes, and macula densa. C. podocytes, capillary endothelium, and basement membrane. D. parietal layer and visceral layer. E. basement membrane, capillary epithelium, and macula densa.
A receptor that binds to a ligand at very low concentrations has a
A) High dissociation constant. B) Low Ka. C) High affinity for the ligand. D) Low affinity for the ligand.