Bio 121 Exam 5 UPDATED ACTUAL Exam
Questions and CORRECT Answers
Organs that recondition the blood: - CORRECT ANSWER - - Receive disproportionately
large percentages of the cardiac output
- Can withstand temporary reductions in blood flow much better than organs that do not
recondition the blood
*Both (a) and (b)
If the arterial blood pressure is recorded at 132/84, what is the mean arterial pressure? -
CORRECT ANSWER - -100 mm Hg
1/3(132-84)= about 16, 84+16=100
Why is mean arterial pressure (MAP) a more accurate measurement than pulse pressure (PP)? -
CORRECT ANSWER - Because MAP takes into account the amount of time the
ventricles spend in diastole and systole while PP does not
What force continues to drive blood through the vasculature during ventricular diastole? -
CORRECT ANSWER - The elastic recoil of the stretched arterial walls provides the force
to continue blood flow in the remaining vascular system during ventricular diastole
Which of the following factors is most important in matching the blood flow through a specific
tissue with the metabolic needs of that tissue? - CORRECT ANSWER - Local changes
within a tissue resulting from increased metabolic activity can produce local arteriolar
vasodilation to allow more blood to flow into the tissue
Each of the following factors promotes the function of capillaries EXCEPT: - CORRECT
ANSWER - A small total surface area
,The principle force that causes movement of fluid from the tissues into the capillaries is the: -
CORRECT ANSWER - Osmotic pressure created by the plasma proteins
Which capillary type (organization) would allow for the most solute exchange and tissue
perfusion? - CORRECT ANSWER - Sinusoidal capillary
Given the following forces acting at a given point across the capillary wall, what type of blood
movement will be taking place at that point?
Capillary blood pressure = 32 mm Hg
Plasma-colloid osmotic pressure = 23 mm Hg
Interstitial-fluid hydrostatic pressure = 1 mm Hg - CORRECT ANSWER - Ultrafiltration
will occur with a net outward pressure of 8 mm Hg
Which of the following is NOT a method used by the body to return blood to the heart? -
CORRECT ANSWER - Parasympathetic induced venuos vasodilation
Which of the would NOT be involved in controlling blood pressure? - CORRECT
ANSWER - Somatic control of arteriole diameter
Why is fainting a protective mechanism for your body? - CORRECT ANSWER - - If your
brain is not receiving oxygen and nutrients due to decreased blood flow, this allows your brain to
immediately receive these blood components
- It counteracts the effects of gravity on venous return
*Both C and D above describe the protective benefits of fainting
Critically applying what you know about bulk flow mechanisms, what effect would late stage
kidney failure (where the kidneys cannot remove water from the blood) have on capillary
exchange at the tissue level? - CORRECT ANSWER - The patient would have increased
ultrafiltration and systemic edema
, (water restricts absorption= edema)
Which activity below is NOT a respiratory event: - CORRECT ANSWER - Cells produce
nitrogen by their metabolism
Of the four steps involved in external respiration, how many are dedicated to the functions of the
respiratory system? - CORRECT ANSWER -2
Intrapleural pressure: - CORRECT ANSWER - - Remains relatively constant since it
normally does not communicate with atmospheric pressure
- Creates a slight vacuum between the lungs and the thoracic cage to allow the lungs to move
with changes in the thoracic cage volume
- Averages about 756mmHG
*All of the above EXCEPT A
When the intra-alveolar pressure becomes greater than atmospheric pressure: - CORRECT
ANSWER - Air will flow out of the lungs
During forceful exhalations: - CORRECT ANSWER - - An active process is performed
- The internal intercostals muscle contract
- The abdominal muscles contract
- The ribs are brought closer together
*All of the above
The inhalations muscles include the: - CORRECT ANSWER - Diaphragm and external
intercostal muscles
Questions and CORRECT Answers
Organs that recondition the blood: - CORRECT ANSWER - - Receive disproportionately
large percentages of the cardiac output
- Can withstand temporary reductions in blood flow much better than organs that do not
recondition the blood
*Both (a) and (b)
If the arterial blood pressure is recorded at 132/84, what is the mean arterial pressure? -
CORRECT ANSWER - -100 mm Hg
1/3(132-84)= about 16, 84+16=100
Why is mean arterial pressure (MAP) a more accurate measurement than pulse pressure (PP)? -
CORRECT ANSWER - Because MAP takes into account the amount of time the
ventricles spend in diastole and systole while PP does not
What force continues to drive blood through the vasculature during ventricular diastole? -
CORRECT ANSWER - The elastic recoil of the stretched arterial walls provides the force
to continue blood flow in the remaining vascular system during ventricular diastole
Which of the following factors is most important in matching the blood flow through a specific
tissue with the metabolic needs of that tissue? - CORRECT ANSWER - Local changes
within a tissue resulting from increased metabolic activity can produce local arteriolar
vasodilation to allow more blood to flow into the tissue
Each of the following factors promotes the function of capillaries EXCEPT: - CORRECT
ANSWER - A small total surface area
,The principle force that causes movement of fluid from the tissues into the capillaries is the: -
CORRECT ANSWER - Osmotic pressure created by the plasma proteins
Which capillary type (organization) would allow for the most solute exchange and tissue
perfusion? - CORRECT ANSWER - Sinusoidal capillary
Given the following forces acting at a given point across the capillary wall, what type of blood
movement will be taking place at that point?
Capillary blood pressure = 32 mm Hg
Plasma-colloid osmotic pressure = 23 mm Hg
Interstitial-fluid hydrostatic pressure = 1 mm Hg - CORRECT ANSWER - Ultrafiltration
will occur with a net outward pressure of 8 mm Hg
Which of the following is NOT a method used by the body to return blood to the heart? -
CORRECT ANSWER - Parasympathetic induced venuos vasodilation
Which of the would NOT be involved in controlling blood pressure? - CORRECT
ANSWER - Somatic control of arteriole diameter
Why is fainting a protective mechanism for your body? - CORRECT ANSWER - - If your
brain is not receiving oxygen and nutrients due to decreased blood flow, this allows your brain to
immediately receive these blood components
- It counteracts the effects of gravity on venous return
*Both C and D above describe the protective benefits of fainting
Critically applying what you know about bulk flow mechanisms, what effect would late stage
kidney failure (where the kidneys cannot remove water from the blood) have on capillary
exchange at the tissue level? - CORRECT ANSWER - The patient would have increased
ultrafiltration and systemic edema
, (water restricts absorption= edema)
Which activity below is NOT a respiratory event: - CORRECT ANSWER - Cells produce
nitrogen by their metabolism
Of the four steps involved in external respiration, how many are dedicated to the functions of the
respiratory system? - CORRECT ANSWER -2
Intrapleural pressure: - CORRECT ANSWER - - Remains relatively constant since it
normally does not communicate with atmospheric pressure
- Creates a slight vacuum between the lungs and the thoracic cage to allow the lungs to move
with changes in the thoracic cage volume
- Averages about 756mmHG
*All of the above EXCEPT A
When the intra-alveolar pressure becomes greater than atmospheric pressure: - CORRECT
ANSWER - Air will flow out of the lungs
During forceful exhalations: - CORRECT ANSWER - - An active process is performed
- The internal intercostals muscle contract
- The abdominal muscles contract
- The ribs are brought closer together
*All of the above
The inhalations muscles include the: - CORRECT ANSWER - Diaphragm and external
intercostal muscles
