Physiology Exam 3 Questions With
Correct Answers
Capillary hydrostatic pressure is 38 mm Hg, capillary colloidal osmotic
| | | | | | | | | |
pressure is 28 mm Hg, interstitial fluid pressure is 2 mm Hg and
| | | | | | | | | | | | |
interstitial colloidal osmotic pressure is 4 mm Hg. The net filtration or
| | | | | | | | | | | |
absorption pressure is: | |
a. 10 mm Hg (filtration)
| | | |
b. 12 mm Hg (filtration)
| | | |
c. 12 mm Hg (absorption)
| | | |
d. 14 mm Hg (filtration)
| | | |
e. 14 mm Hg (absorption)
| | | |
(2009) - CORRECT ANSWER✔✔-12 mm Hg (filtration)
| | | | | |
Increasing the length of a skeletal muscle prior to an isometric
| | | | | | | | | | |
contraction
Choose one answer.| |
a. Has no effect on the force of contraction
| | | | | | | |
b. Can only decrease the force of contraction
| | | | | | |
,c. Can only increase the force of contraction
| | | | | | |
d. May either decrease or increase the force that can be developed,
| | | | | | | | | | | |
depending on the original length of the muscle| | | | | | |
e. Is not possible
| | |
(2009) - CORRECT ANSWER✔✔-May either decrease or increase the
| | | | | | | | |
force that can be developed, depending on the original
| | | | | | | |
length of the muscle
| | |
An increase in arterial PCO2 leads to:
| | | | | |
a. A decrease in CO2 in cerebrospinal fluid
| | | | | | |
b. Activation of the carotid baroreceptors
| | | | |
c. Decreased activity of the carotid bodies (chemoreceptors)
| | | | | | |
d. Stimulation of medullary inspiratory neurons
| | | | |
e. All of the answers provided
| | | | |
(2009) - CORRECT ANSWER✔✔-Stimulation of medullary inspiratory
| | | | | | |
neurons
Sinoatrial "pacemaker" cells are: | | |
a. Stable with regard to their membrane potentials
| | | | | | |
b. Found in both atria
| | | |
,c. Innervated by the vagus nerve
| | | | |
d. Unable to generate impulses when completely denervated
| | | | | | |
e. Connected to the AV node by Purkinje fibers
| | | | | | | |
(2009) - CORRECT ANSWER✔✔-Innervated by the vagus nerve
| | | | | | |
When the radius of resistance vessels is increased, which one of the
| | | | | | | | | | | |
following is increased?
| |
a. Systolic blood pressure
| | |
b. Diastolic blood pressure
| | |
c. Viscosity of blood
| | |
d. Hematocrit
|
e. Capillary blood flow
| | |
(2009) - CORRECT ANSWER✔✔-Capillary blood flow
| | | | |
During isovolumetric (isometric) ventricular contraction in the healthy
| | | | | | | |
heart:
a. The entry and exit valves are closed
| | | | | | |
b. Pressure in the aorta rises
| | | | |
c. Pressure in the atria falls
| | | | |
d. You hear the third heart sound
| | | | | |
, e. Corresponds with the QRS complex in the electrocardiogram
| | | | | | | |
(2009) - CORRECT ANSWER✔✔-The entry and exit valves are closed
| | | | | | | | |
The primary role of calcium in the activation of cardiac and skeletal
| | | | | | | | | | | |
muscle is to: | |
a. Provide the energy necessary for contraction
| | | | | |
b. Activate myosin molecules so that they can interact with actin
| | | | | | | | | | |
filaments
c. Cause depolarization of the muscle cell plasma membrane
| | | | | | | |
d. Remove the inhibition of the reaction between the actin filaments
| | | | | | | | | | |
and the myosin filaments
| | |
e. Bind to calmodulin and increase the entry of sodium ions in the
| | | | | | | | | | | | |
muscle fiber |
(2009) - CORRECT ANSWER✔✔-Remove the inhibition of the reaction
| | | | | | | | |
between the actin filaments and the myosin filaments
| | | | | | |
Which characteristics are found in skeletal muscle fibers best adapted to
| | | | | | | | | |
produce fast and powerful movements?
| | | | |
a. High capillary density, red color, resistant to fatigue, mostly aerobic
| | | | | | | | | | |
metabolism
Correct Answers
Capillary hydrostatic pressure is 38 mm Hg, capillary colloidal osmotic
| | | | | | | | | |
pressure is 28 mm Hg, interstitial fluid pressure is 2 mm Hg and
| | | | | | | | | | | | |
interstitial colloidal osmotic pressure is 4 mm Hg. The net filtration or
| | | | | | | | | | | |
absorption pressure is: | |
a. 10 mm Hg (filtration)
| | | |
b. 12 mm Hg (filtration)
| | | |
c. 12 mm Hg (absorption)
| | | |
d. 14 mm Hg (filtration)
| | | |
e. 14 mm Hg (absorption)
| | | |
(2009) - CORRECT ANSWER✔✔-12 mm Hg (filtration)
| | | | | |
Increasing the length of a skeletal muscle prior to an isometric
| | | | | | | | | | |
contraction
Choose one answer.| |
a. Has no effect on the force of contraction
| | | | | | | |
b. Can only decrease the force of contraction
| | | | | | |
,c. Can only increase the force of contraction
| | | | | | |
d. May either decrease or increase the force that can be developed,
| | | | | | | | | | | |
depending on the original length of the muscle| | | | | | |
e. Is not possible
| | |
(2009) - CORRECT ANSWER✔✔-May either decrease or increase the
| | | | | | | | |
force that can be developed, depending on the original
| | | | | | | |
length of the muscle
| | |
An increase in arterial PCO2 leads to:
| | | | | |
a. A decrease in CO2 in cerebrospinal fluid
| | | | | | |
b. Activation of the carotid baroreceptors
| | | | |
c. Decreased activity of the carotid bodies (chemoreceptors)
| | | | | | |
d. Stimulation of medullary inspiratory neurons
| | | | |
e. All of the answers provided
| | | | |
(2009) - CORRECT ANSWER✔✔-Stimulation of medullary inspiratory
| | | | | | |
neurons
Sinoatrial "pacemaker" cells are: | | |
a. Stable with regard to their membrane potentials
| | | | | | |
b. Found in both atria
| | | |
,c. Innervated by the vagus nerve
| | | | |
d. Unable to generate impulses when completely denervated
| | | | | | |
e. Connected to the AV node by Purkinje fibers
| | | | | | | |
(2009) - CORRECT ANSWER✔✔-Innervated by the vagus nerve
| | | | | | |
When the radius of resistance vessels is increased, which one of the
| | | | | | | | | | | |
following is increased?
| |
a. Systolic blood pressure
| | |
b. Diastolic blood pressure
| | |
c. Viscosity of blood
| | |
d. Hematocrit
|
e. Capillary blood flow
| | |
(2009) - CORRECT ANSWER✔✔-Capillary blood flow
| | | | |
During isovolumetric (isometric) ventricular contraction in the healthy
| | | | | | | |
heart:
a. The entry and exit valves are closed
| | | | | | |
b. Pressure in the aorta rises
| | | | |
c. Pressure in the atria falls
| | | | |
d. You hear the third heart sound
| | | | | |
, e. Corresponds with the QRS complex in the electrocardiogram
| | | | | | | |
(2009) - CORRECT ANSWER✔✔-The entry and exit valves are closed
| | | | | | | | |
The primary role of calcium in the activation of cardiac and skeletal
| | | | | | | | | | | |
muscle is to: | |
a. Provide the energy necessary for contraction
| | | | | |
b. Activate myosin molecules so that they can interact with actin
| | | | | | | | | | |
filaments
c. Cause depolarization of the muscle cell plasma membrane
| | | | | | | |
d. Remove the inhibition of the reaction between the actin filaments
| | | | | | | | | | |
and the myosin filaments
| | |
e. Bind to calmodulin and increase the entry of sodium ions in the
| | | | | | | | | | | | |
muscle fiber |
(2009) - CORRECT ANSWER✔✔-Remove the inhibition of the reaction
| | | | | | | | |
between the actin filaments and the myosin filaments
| | | | | | |
Which characteristics are found in skeletal muscle fibers best adapted to
| | | | | | | | | |
produce fast and powerful movements?
| | | | |
a. High capillary density, red color, resistant to fatigue, mostly aerobic
| | | | | | | | | | |
metabolism
