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1.
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Refer to the illustration above. The structure labeled X is the
a. | diaphragm. | c. | pharynx. | b. | larynx. | d. | trachea. |
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2.
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When the diaphragm and rib cage muscles relax,
a. | it is impossible to breathe. | c. | exhalation
occurs. | b. | the chest cavity enlarges. | d. | inhalation occurs. |
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3.
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Which of the following occurs as air rushes into the lungs from the environment
to equalize air pressure?
a. | contraction | c. | exhalation | b. | inhalation | d. | speech |
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4.
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Blood is carried to and from the cells of the body by the
a. | veins. | b. | arteries. | c. | capillaries. | d. | muscles. |
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5.
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When your heart and breathing speed up or slow down, your body is trying
to
a. | increase lung volume. | b. | bring in more carbon
dioxide. | c. | maintain homeostasis. | d. | increase its red blood
cells. |
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6.
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The arteries and arterioles of the circulatory system transport O
a. | lungs. | b. | heart. | c. | cells. | d. | mouth. |
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7.
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Oxygen diffuses into the blood from the
a. | trachea. | b. | alveoli. | c. | aorta. | d. | bronchioles. |
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8.
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The dome-shaped muscle below the chest cavity is called the
a. | larynx. | c. | pharynx. | b. | diaphragm. | d. | trachea. |
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9.
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Which of the following is not a function of the human cardiovascular
system?
a. | filtering wastes out of the blood | b. | distributing nutrients throughout the
body | c. | carrying wastes to the urinary system | d. | helping the body maintain a constant body
temperature |
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10.
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The smallest and most numerous blood vessels in the body are the
a. | veins. | c. | venules. | b. | capillaries. | d. | arteries. |
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11.
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The huge surface area in the lungs where O
a. | alveoli. | b. | bronchioles. | c. | trachea. | d. | bronchi. |
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12.
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Which part of the respiratory system greatly increases its interior surface
area?
a. | alveoli clusters | b. | trachea cartilage rings | c. | bronchiole
openings | d. | sinus cilia |
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13.
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Why is it difficult for your body to return blood from your feet when you sit
for too long?
a. | The heart does not beat fast enough at rest. | b. | Skeletal muscles are
not squeezing the veins. | c. | Gravity makes the blood flow
backward. | d. | Blood has to travel a greater distance. |
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14.
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Oxygen is distributed throughout the body by the respiratory system.
____________________
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15.
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The blood in veins is
a. | leaving the lungs. | b. | carrying oxygen. | c. | traveling to the
heart. | d. | moving in single file. |
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16.
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The actual exchange of gases occurs at the site of the
a. | alveoli. | c. | larynx. | b. | trachea. | d. | nasal
passageway. |
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17.
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Vessels that carry blood away from the heart are called
a. | capillaries. | c. | veins. | b. | venules. | d. | arteries. |
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18.
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Blood is carried through the body in blood vessels.
____________________
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19.
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What determines whether molecules diffuse into or out of the blood?
a. | the concentration of molecules dissolved in plasma | b. | the number of
capillaries the blood flows through | c. | the ratio of red blood cells to white blood
cells | d. | the surface protein markers that indicate blood type |
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20.
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Which muscles help blood return to the heart?
a. | cardiac | b. | arterial | c. | smooth | d. | skeletal |
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21.
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A pulmonary artery carries blood from
a. | the right ventricle to the lung. | b. | one lung to the other. | c. | the lung to the left
atrium. | d. | the pulmonary vein to the heart. |
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22.
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Which of the following actions increases the volume of your lungs?
a. | The diaphragm flattens and moves downward. | b. | Air pressure
increases inside the lungs. | c. | The rib cage becomes
smaller. | d. | Gases move from areas of lower pressure. |
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23.
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An artery
a. | has thin, slightly elastic walls. | b. | has valves that prevent blood from flowing
backward. | c. | is smaller than an arteriole. | d. | usually carries oxygen-rich
blood. |
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24.
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In which direction would oxygen-rich blood flow in this diagram?  a. | from C to A | b. | from A to C | c. | from B to
A | d. | from C to D |
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