Biology (Raven), 9th Edition

Chapter 50: The Circulatory System

Post-Test

1
All invertebrates have open circulatory systems with hemolymph instead of blood.
A)True
B)False
2
Amphibians have a three chambered heart with two atria and one ventricle. The consequence of this is:
A)the potential for mixing of oxygenated and deoxygenated blood in the ventricle.
B)the heart has to work harder to pump blood to the body.
C)the potential for mixing of oxygenated and deoxygenated blood in the atria.
D)increased oxygen carrying capacity.
E)none of the above
3
Venous pressure alone is sufficient to return blood to the heart.
A)True
B)False
4
Antidiuretic hormone (ADH) or vasopressin is secreted by the posterior pituitary in response to an increase in the osmolarity of the blood plasma. What happens if a person becomes dehydrated?
A)more ADH will be secreted
B)less ADH will be secreted
C)the person will urinate less
D)the blood pressure will increase
E)more than one of these is correct.
5
What is NOT true about erythrocytes?
A)Mature mammalian erythrocytes have nuclei.
B)Vertebrate erythrocytes contain hemoglobin.
C)Each microliter of blood contains about 5 million erythrocytes.
D)They have the shape of a biconcave disc.
E)They are important in the transport of oxygen and carbon dioxide.
6
Closed circulatory systems:
A)are found in vertebrates.
B)contain hemolymph.
C)move fluid in a loop.
D)are not found in invertebrates.
E)More than one of these are correct.
7
The efficient circulatory system of mammals and birds is thought to have been important in the evolution of:
A)heterothermy.
B)homothermy.
C)endothermy.
D)exothermy.
E)none of the above
8
What is NOT true of the cells in the sinoatrial (SA) node?
A)They are the heart's pacemaker.
B)They generate spontaneous action potentials at a slower rate than other autorhythmic cells.
C)The spontaneous action potentials are due to constant leakage of Na+ ions into the cell.
D)They generate an action potential every 0.6 seconds.
E)They represent the evolution of the sinus venosus from fish.
9
What causes water to move into the capillaries from the interstitial fluid?
A)osmotic pressure because protein concentration is greater in the interstitial fluid
B)blood pressure
C)osmotic pressure because protein concentration is lower in the interstitial fluid
D)active transport
E)more than one of these is correct.
10
What occurs when a baroreceptor senses an increase in blood pressure?
A)increased heart rate, vasoconstriction
B)increased heart rate, vasodilation
C)decreased heart rate, vasoconstriction
D)decreased heart rate, vasodilation
E)none of the above
11
Leukocytes:
A)comprise 5% of the cells in human blood.
B)are smaller than erythrocytes.
C)are not confined to the blood but can move out of the capillaries into the interstitial fluid.
D)are all classified as granular.
E)more than one of these is correct.
12
Which of the following is a function of the vertebrate circulatory system?
A)Regulating body temperature.
B)Transporting metabolic wastes.
C)Providing immunological defense.
D)Transporting oxygen and carbon dioxide.
E)All of these.
13
Which of the following is NOT true regarding the circulatory systems in vertebrates?
A)Blood pressure in fish drops significantly in passing through the capillaries in the gills.
B)Reptiles have a septum that partially subdivides the ventricle.
C)The amphibian heart has a single ventricle.
D)Blood leaving the gills in fish travels directly back to the heart to be pumped to the rest of the body.
E)There is no mixing of oxygenated and deoxygenated blood in the mammalian heart.
14
Interstitial fluid is derived from fluid that is forced out of the
A)arteries.
B)veins.
C)arteriole end of capillaries.
D)venule end of capillaries.
E)lymph vessels.
15
Platelets are formed from the cytoplasm of
A)erythrocytes.
B)granular leukocytes.
C)nongranular leukocytes.
D)megakaryocytes.
E)heart muscle cells.
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