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TEST BANK FOR Guyton and Hall Textbook of Medical Physiology (Guyton Physiology) 14th Edition
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TEST BANK FORGuyton and Hall Textbook of Medical Physiology (Guyton
Physiology) 14th Edition
11. Which of the following is an example of a ―feed-forward‖ control system?
a. The arterial baroreceptor system
b. The progressive nature of uterine contractions during childbirth
c. Control of skeletal muscle movements by the brain
d. Generation of an action potential
ANS: C
12. Which of the following is an example of negative feedback? Example 1: Arterial
baroreceptor control of blood pressure
Example 2: Excitation of the respiratory center by increased blood carbon dioxide concentration
Example 3: Hemorrhagic shock caused by severe blood loss
a. Example 1 only
b. Example 2 only
c. Example 3 only
d. Examples 1 and 2, but not 3
e. Examples 1, 2, and 3
ANS: D
Chapter 01: Functional Organization of the Human Body and Control of the ―Internal
Environment‖
Hall: Guyton and Hall Textbook of Medical Physiology, 14th Edition
,MULTIPLE CHOICE
1. Which of the following statements about homeostasis is incorrect?
a. It refers to the maintenance of a stable internal environment for the body.
b. Homeostatic mechanisms do not operate in diseases.
c. Homeostasis requires integrated actions of the cells, tissues, organs, and multiple
nervous, hormonal, and local control systems.
d. Homeostatic compensations that begin after a major environmental challenge may
contribute to abnormalities of body function.
ANS: B
2. What is the most abundant type of cell in the human body?
a. Neuron
b. Epithelial cell
c. Red blood cell
d. White blood cell
e. Vascular smooth muscle cell
f. Skeletal muscle cell
ANS: C
3. The most abundant substance in the human body and the approximate percentage of that
substance in the body is which of the following?
a. Protein, 30%
b. Protein, 60%
c. Water, 30%
d. Water, 60%
e. Carbohydrate, 30%
f. Carbohydrate, 60%
ANS: D
,4. If the feedback gain of a control system is 2.0, this means that the system is
a. a negative feedback system capable of correcting 1/2 of the initial disturbance to
the system.
b. a negative feedback system capable of correcting 2/3 of the initial disturbance to
the system.
c. a negative feedback system capable of correcting 3/4 of the initial disturbance to
the system.
d. a positive feedback system capable of correcting 1/2 of the initial disturbance to the
system.
e. a positive feedback system capable of correcting 2/3 of the initial disturbance to the
system.
f. a positive feedback system capable of correcting 3/4 of the initial disturbance to the
system.
ANS: B
5. Which of the following substances has the highest extracellular fluid to intracellular
fluid concentration ratio for most mammalian cells?
a. Sodium ions
b. Potassium ions
c. Carbon dioxide
d. Glucose
e. Protein
ANS: A
6. Exchange of substances between the cardiovascular system and the interstitial fluid
occurs mainly in which of the following?
a. Arteries
b. Arterioles
, c. Capillaries
d. Venules
e. Veins
ANS: C
7. What is the approximate distance from the capillaries to most cells of the body?
a. Less than 50 angstroms
b. Less than 50 microns
c. Less than 50 millimeters
d. Less than 100 angstroms
e. Less than 100 microns
f. Less than 100 millimeters
ANS: A
8. When a person is at rest, how much time is required for the blood in the circulation to
traverse the entire circulatory circuit?
a. 1 second
b. 1 minute
c. 3 minutes
d. 4 minutes
e. 5 minutes
ANS: B
9. The type of control system that can sometimes cause instability and vicious cycles is called
a. negative feedback.
b. feed-forward control.
c. positive feedback.
d. adaptive feedback.
e. delayed negative feedback.
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