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Chapter 42 Online Review



Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

 1. 

To adjust blood pressure independently in the capillaries of the gas-exchange surface and in the capillaries of the general body circulation, an organism would need a(n)
a.
open circulatory system.
b.
hemocoel.
c.
lymphatic system.
d.
two-chambered heart.
e.
four-chambered heart.
 
 
Refer to the diagram of the human heart in the figure below to answer the following questions.

chpt42_files/i0030000.jpg
 

 2. 

What is the correct sequence of blood flow, beginning at the pulmonary artery?
a.
2-1-4-systemic circulation-3-5-6
b.
3-5-6-systemic circulation-2-1-4
c.
4-5-6-3-systemic circulation-2-1
d.
4-systemic circulation-2-1-6-3-5
e.
5-6-3-2-1-4
 

 3. 

A nonfunctional sinoatrial node would
a.
have no adverse effects on heart contraction.
b.
cause the heart to stop beating in an autorhythmic fashion.
c.
result in a block in ventricular contractions.
d.
cause no effects because hormones will take over regulation of the heart beat.
e.
have no significant effect on stroke volume.
 

 4. 

Which of the following is not a function of plasma proteins in humans?
a.
maintenance of blood osmotic pressure
b.
transport of water-insoluble lipids
c.
blood clotting
d.
immune responses
e.
oxygen transport
 

 5. 

Tidal volume in respiration is analogous to what measurement in cardiac physiology?
a.
cardiac output
b.
heart rate
c.
stroke volume
d.
systolic pressure
e.
diastolic pressure
 

 6. 

Why is the respiratory system of a bird more efficient than the human respiratory system?
a.
The bird respiratory system does not mix exhaled air with inhaled air.
b.
A bird lung contains multiple alveoli, which increases the amount of surface area available for gas exchange.
c.
The human respiratory system ends in small parabronchi, which reduce the amount of surface area available for gas exchange.
d.
Only B and C are correct.
e.
A, B, and C are correct.
 

 7. 

At sea level, atmospheric pressure is 760 mm Hg. Oxygen gas is approximately 21% of the total gases in the atmosphere. What is the approximate partial pressure of oxygen?
a.
0.2 mm Hg
b.
20.0 mm Hg
c.
76.0 mm Hg
d.
160.0 mm Hg
e.
508.0 mm Hg
 

 8. 

Which one of these statements about lungs is false?
a.
Gas exchange takes place across moist membranes.
b.
The gases move across the exchange membranes by diffusion.
c.
The total exchange surface area is relatively large.
d.
The lining of the alveoli is only one cell thick.
e.
The concentration of CO2 is higher in the air than in the alveolar capillaries.
 
 
Use the data shown below to answer the following questions.

Blood entering a capillary bed of a vertebrate was measured for the pressures exerted by various factors.
 
Arterial End of Capillary Bed
Verous End of Capillary Bed
Hydrostatic pressure
8 mm Hg
14 mm Hg
Osmotic pressure
26 mm Hg
26 mm Hg
chpt42_files/i0110000.jpg
100 mm Hg
42 mm Hg
chpt42_files/i0110001.jpg
40 mm Hg
46 mm Hg
 

 9. 

Which of the following is false concerning the hemoglobin molecule?
a.
It contains amino acids.
b.
It contains iron.
c.
It is composed of four polypeptide chains.
d.
It can bind four O2 molecules.
e.
It is found in humans only.
 

 10. 

Hydrogen ions produced in human red blood cells are prevented from significantly lowering pH by combining with
a.
hemoglobin.
b.
plasma proteins.
c.
carbon dioxide.
d.
carbonic acid.
e.
plasma buffers.
 



 
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