3 3
Guyton3and3Hall3Textbook3of3Medical3Physiology3(Guyton3Physiology)314th3E
dition
Chapter301:3Functional3Organization3of3the3Human3Body3and3Control3of3the3―Internal3Environ
ment‖
Hall:3Guyton3and3Hall3Textbook3of3Medical3Physiology,314th3Edition
MULTIPLE3CHOICE
1. Which3of3the3following3statements3about3homeostasis3is3incorrect?
a. It3refers3to3the3maintenance3of3a3stable3internal3environment3for3the3body.
b. Homeostatic3mechanisms3do3not3operate3in3diseases.
c. Homeostasis3requires3integrated3actions3of3the3cells,3tissues,3organs,3and3multiple
nervous,3hormonal,3and3local3control3systems.
d. Homeostatic3compensations3that3begin3after3a3major3environmental3challenge3ma
y
contribute3to3abnormalities3of3body3function.
ANS:3 B
2. What3is3the3most3abundant3type3of3cell3in3the3human3body?
a. Neuron
b. Epithelial3cell
c. Red3blood3cell
d. White3blood3cell
e. Vascular3smooth3muscle3cell
f. Skeletal3muscle3cell
ANS:3 C
3. The3most3abundant3substance3in3the3human3body3and3the3approximate3percentage3of3th
at3substance3in3the3body3is3which3of3the3following?
a. Protein,330%
b. Protein,360%
c. Water,330%
d. Water,360%
e. Carbohydrate,330%
f. Carbohydrate,360%
ANS:3 D
4. If3the3feedback3gain3of3a3control3system3is3 2.0,3this3means3that3the3system3is
a. a3negative3feedback3system3capable3of3correcting31/23of3the3initial3disturbance3t
o
the3system.
, b. a3negative3feedback3system3capable3of3correcting32/33of3the3initial3disturbance3 t
o
the3system.
c. a3negative3feedback3system3capable3of3correcting33/43of3the3initial3disturbance3t
o
the3system.
d. a3positive3feedback3system3capable3of3correcting31/23of3the3initial3disturbance3t
o
the3system.
e. a3positive3feedback3system3capable3of3correcting32/33of3the3initial3disturbance3t
o
the3system.
f. a3positive3feedback3system3capable3of3correcting33/43of3the3initial3disturbance3t
o
the3system.
ANS:3 B
5. Which3of3the3following3substances3has3the3highest3extracellular3fluid3to3intracellular3flui
d3concentration3ratio3for3most3mammalian3cells?
a. Sodium3ions
b. Potassium3ions
c. Carbon3dioxide
d. Glucose
e. Protein
ANS:3 A
6. Exchange3of3substances3between3the3cardiovascular3system3and3the3interstitial3fluid3occur
s3mainly3in3which3of3the3following?
a. Arteries
b. Arterioles
c. Capillaries
d. Venules
e. Veins
ANS:3 C
7. What3is3the3approximate3distance3from3the3capillaries3to3most3cells3of3the3body?
a. Less3than3503angstroms
b. Less3than3503microns
c. Less3than3503millimeters
d. Less3than31003angstroms
e. Less3than31003microns
f. Less3than31003millimeters
ANS:3 A
8. When3a3person3is3at3rest,3how3much3time3is3required3for3the3blood3in3the3circulation3
to3traverse3the3entire3circulatory3circuit?
a. 13second
, b. 13minute
c. 33minutes
d. 43minutes
e. 53minutes
ANS:3 B
9. The3type3of3control3system3that3can3sometimes3cause3instability3and3vicious3cycles3i
s3called
, a. negative3feedback.
b. feed-forward3control.
c. positive3feedback.
d. adaptive3feedback.
e. delayed3negative3feedback.
ANS:3 C
10. Which3of3the3following3is3an3example3of3positive3feedback3in3the3body?
a. Return3of3blood3pressure3toward3normal3after3a3hemorrhage
b. Generation3of3action3potentials3in3nerves
c. Increased3respiration3rate3caused3by3accumulation3of3carbon3dioxide3in3the3bloo
d
d. Decreased3sympathetic3nervous3system3activity3that3occurs3in3response3to
increased3blood3pressure
ANS:3 B
11. Which3of3the3following3is3an3example3of3a3―feed-forward‖3control3system?
a. The3arterial3baroreceptor3system
b. The3progressive3nature3of3uterine3contractions3during3childbirth
c. Control3of3skeletal3muscle3movements3by3the3brain
d. Generation3of3an3action3potential
ANS:3 C
12. Which3of3the3following3is3an3example3of3negative3feedback
?3Example31:3Arterial3baroreceptor3control3of3blood3pressur
e
Example32:3Excitation3of3the3respiratory3center3by3increased3blood3carbon3dioxide3conce
ntration
Example33:3Hemorrhagic3shock3caused3by3severe3blood3loss
a. Example313only
b. Example323only
c. Example333only
d. Examples313and32,3but3not33
e. Examples31,32,3and33
ANS:3 D
Chapter302:3The3Cell3and3Its3Functions
Hall:3Guyton3and3Hall3Textbook3of3Medical3Physiology,314th3Edition
MULTIPLE3CHOICE
1. The3most3abundant3cell3membrane3lipids3are
a. sphingolipids.
b. phospholipids.
c. cholesterol.
d. triglycerides.
e. sterols.