Oxygenated blood flow through the:
B. pulmonary veins.
The hepatic vein carries blood from the:
C. liver to the vena cava.
The position of the heart in the mediastinum is:
D. between the lungs, superior to the diaphragm.
The pericardial space is found between the:
D. visceral and parietal pericardium.
In the normal cardiac cycle, which of the following occurs? (More than one answer may be correct)
- B. The two atria contract simultaneously, whereas the two ventricles relax.
- c. The two ventricles contract simultaneously, whereas the two atria relax.
The QRS complex of the EKG represents:
D. ventricular depolarization.
A person having a heart rate of 100, a systolic blood pressure of 200, and a stroke volume of 40 ml would have an average cardiac output of:
E. None of the above is correct.
During atrial systole, the:
B. atrioventricular valves are open.
Which does not significantly affect heart rate?
A. atrioventricular valves
One cardiac cycle:
E. Both a and b are correct. (a. has a duration that changes if the heart rate changes. b. usually requires less than 1 second to complete.)
Compared with arteries, veins:
A. have a larger diameter
Normal systolic pressure within the left ventricle is in the range of:
A. 90 to 140 mm Hg.
Backflow of blood from the arteries into the relaxing ventricles is prevented by the:
B. semilunar valves.
D. exhibits powerful vasodilatory activity.
The Frank-Starling law of the heart concerns the relationship between:
D. the length of the cardiac muscle fiber and the strength of contraction.
How does cardiac muscle differ from skeletal muscle? It is (more than one answer may be correct):
- A. arranged in branching networks.
- d. single-nucleated.
- e. more accessible to sodium and potassium ions.
Blood pressure is measured by the:
A. pressure exerted on arteries by the blood.
Identify the correct sequence of the portions of the pulmonary circulation.
1. pulmonary veins
2. pulmonary arteries
4. right ventricle
5. left atrium
A. 4, 2, 3, 1, 5
The normal heartbeat is initiated by the:
E. SA node.
If the sympathetic nervous system stimulation of the heart predominates over parasympathetic nervous system stimulation, the heart will:
D. increase its rate.
When blood exhibits a turbulent flow:
A. resistance increases.
Identify the normal sequence of an electrical impulse through the heart's conduction system.
1. atrioventricular bundle
2. AV node
3. Purkinje fibers
4. SA node
5. right and left bundle branches
B. 4, 2, 1, 5, 3
Which factor might increase resistance to the flow of blood through the blood vessels?
C. decreased numbers of capillaries
Depolarization of cardiac muscle cells occurs because of:
A. the cell's interior becoming less negatively charged.
Which statement is true?
B. Lymph from the entire body, except for the upper right quadrant, eventually drains into the thoracic duct.