Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
|
|
|
1.
|
An
artery has a much thicker muscle layer than does a. | a vein. | c. | a venule. | b. | a
capillary. | d. | All of the
above | | | | |
|
|
|
|
|
|
2.
|
Refer
to the illustration above. The cells shown are a. | filled with plasma. | c. | red blood cells. | b. | platelets. | d. | white blood
cells. | | | | |
|
|
|
3.
|
Refer
to the illustration above. The cells shown a. | can live for at least a year. | b. | are the largest
cells in the circulatory system. | c. | promote clotting. | d. | contain
hemoglobin. | | |
|
|
|
4.
|
The
pacemaker responsible for starting a heartbeat a. | is located in the brain. | b. | squeezes the
ventricles shut. | c. | is a small bundle of cells at the entrance to the right
atrium. | d. | is in the aorta. | | |
|
|
|
|
|
|
5.
|
Refer
to the illustration above. The structure labeled X is the a. | epiglottis. | c. | trachea. | b. | pharynx. | d. | larynx. | | | | |
|